diff --git a/App.tsx b/App.tsx
index 0329d0c..2513238 100644
--- a/App.tsx
+++ b/App.tsx
@@ -1,10 +1,12 @@
 import { StatusBar } from 'expo-status-bar';
+import React from 'react';
 import { StyleSheet, Text, View } from 'react-native';
+import StopWatch from './src/StopWatch';
 
 export default function App() {
   return (
     <View style={styles.container}>
-      <Text>Open up App.tsx to start working on your app!</Text>
+      <StopWatch/>
       <StatusBar style="auto" />
     </View>
   );
diff --git a/package-lock.json b/package-lock.json
index ea36168..52c623d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,18 +10,19 @@
       "dependencies": {
         "expo": "~49.0.15",
         "expo-status-bar": "~1.6.0",
-        "jest": "^29.2.1",
         "jest-expo": "~49.0.0",
         "react": "18.2.0",
         "react-native": "0.72.6"
       },
       "devDependencies": {
         "@babel/core": "^7.20.0",
+        "@testing-library/react": "^14.1.2",
         "@testing-library/react-native": "^12.4.3",
         "@tsconfig/react-native": "^3.0.2",
         "@types/jest": "^29.5.11",
         "@types/react": "~18.2.14",
         "@types/react-test-renderer": "^18.0.7",
+        "jest": "^29.7.0",
         "typescript": "^5.3.3"
       }
     },
@@ -6911,6 +6912,139 @@
         "@sinonjs/commons": "^3.0.0"
       }
     },
+    "node_modules/@testing-library/dom": {
+      "version": "9.3.4",
+      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-9.3.4.tgz",
+      "integrity": "sha512-FlS4ZWlp97iiNWig0Muq8p+3rVDjRiYE+YKGbAqXOu9nwJFFOdL00kFpz42M+4huzYi86vAK1sOOfyOG45muIQ==",
+      "dev": true,
+      "dependencies": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/runtime": "^7.12.5",
+        "@types/aria-query": "^5.0.1",
+        "aria-query": "5.1.3",
+        "chalk": "^4.1.0",
+        "dom-accessibility-api": "^0.5.9",
+        "lz-string": "^1.5.0",
+        "pretty-format": "^27.0.2"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/@testing-library/dom/node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "dev": true,
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/@testing-library/dom/node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/@testing-library/dom/node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "dev": true,
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/@testing-library/dom/node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+      "dev": true
+    },
+    "node_modules/@testing-library/dom/node_modules/has-flag": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
+      "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@testing-library/dom/node_modules/pretty-format": {
+      "version": "27.5.1",
+      "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-27.5.1.tgz",
+      "integrity": "sha512-Qb1gy5OrP5+zDf2Bvnzdl3jsTf1qXVMazbvCoKhtKqVs4/YK4ozX4gKQJJVyNe+cajNPn0KoC0MC3FUmaHWEmQ==",
+      "dev": true,
+      "dependencies": {
+        "ansi-regex": "^5.0.1",
+        "ansi-styles": "^5.0.0",
+        "react-is": "^17.0.1"
+      },
+      "engines": {
+        "node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
+      }
+    },
+    "node_modules/@testing-library/dom/node_modules/pretty-format/node_modules/ansi-styles": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
+      "integrity": "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==",
+      "dev": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/@testing-library/dom/node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dev": true,
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@testing-library/react": {
+      "version": "14.1.2",
+      "resolved": "https://registry.npmjs.org/@testing-library/react/-/react-14.1.2.tgz",
+      "integrity": "sha512-z4p7DVBTPjKM5qDZ0t5ZjzkpSNb+fZy1u6bzO7kk8oeGagpPCAtgh4cx1syrfp7a+QWkM021jGqjJaxJJnXAZg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.12.5",
+        "@testing-library/dom": "^9.0.0",
+        "@types/react-dom": "^18.0.0"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "peerDependencies": {
+        "react": "^18.0.0",
+        "react-dom": "^18.0.0"
+      }
+    },
     "node_modules/@testing-library/react-native": {
       "version": "12.4.3",
       "resolved": "https://registry.npmjs.org/@testing-library/react-native/-/react-native-12.4.3.tgz",
@@ -6979,6 +7113,12 @@
       "integrity": "sha512-F7IoHEqf741lut4Z2K+IkWQRvXAhBiZMeY5L7BysG7Z2Z3MlIyFR+AagD8jQ/CqC1vowGnRwfLjeuwIpaeoJxA==",
       "dev": true
     },
+    "node_modules/@types/aria-query": {
+      "version": "5.0.4",
+      "resolved": "https://registry.npmjs.org/@types/aria-query/-/aria-query-5.0.4.tgz",
+      "integrity": "sha512-rfT93uj5s0PRL7EzccGMs3brplhcrghnDoV26NqKhCAS1hVo+WdNsPvE/yb6ilfr5hi2MEk6d5EWJTKdxg8jVw==",
+      "dev": true
+    },
     "node_modules/@types/babel__core": {
       "version": "7.20.5",
       "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.20.5.tgz",
@@ -7122,6 +7262,15 @@
         "csstype": "^3.0.2"
       }
     },
+    "node_modules/@types/react-dom": {
+      "version": "18.2.18",
+      "resolved": "https://registry.npmjs.org/@types/react-dom/-/react-dom-18.2.18.tgz",
+      "integrity": "sha512-TJxDm6OfAX2KJWJdMEVTwWke5Sc/E/RlnPGvGfS0W7+6ocy2xhDVQVh/KvC2Uf7kACs+gDytdusDSdWfWkaNzw==",
+      "dev": true,
+      "dependencies": {
+        "@types/react": "*"
+      }
+    },
     "node_modules/@types/react-test-renderer": {
       "version": "18.0.7",
       "resolved": "https://registry.npmjs.org/@types/react-test-renderer/-/react-test-renderer-18.0.7.tgz",
@@ -7360,6 +7509,28 @@
         "sprintf-js": "~1.0.2"
       }
     },
+    "node_modules/aria-query": {
+      "version": "5.1.3",
+      "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-5.1.3.tgz",
+      "integrity": "sha512-R5iJ5lkuHybztUfuOAznmboyjWq8O6sqNqtK7CLOqdydi54VNbORp49mb14KbWgG1QD3JFO9hJdZ+y4KutfdOQ==",
+      "dev": true,
+      "dependencies": {
+        "deep-equal": "^2.0.5"
+      }
+    },
+    "node_modules/array-buffer-byte-length": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-buffer-byte-length/-/array-buffer-byte-length-1.0.0.tgz",
+      "integrity": "sha512-LPuwb2P+NrQw3XhxGc36+XSvuBPopovXYTR9Ew++Du9Yb/bx5AzBfrIsBoj0EZUifjQU+sHL21sseZ3jerWO/A==",
+      "dev": true,
+      "dependencies": {
+        "call-bind": "^1.0.2",
+        "is-array-buffer": "^3.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/array-union": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
@@ -7415,6 +7586,18 @@
         "node": ">= 4.0.0"
       }
     },
+    "node_modules/available-typed-arrays": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.5.tgz",
+      "integrity": "sha512-DMD0KiN46eipeziST1LPP/STfDU0sufISXmjSgvVsoU2tqxctQeASejWcfNtxYKqETM1UxQ8sp2OrSBWpHY6sw==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/babel-core": {
       "version": "7.0.0-bridge.0",
       "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-7.0.0-bridge.0.tgz",
@@ -8741,6 +8924,44 @@
         }
       }
     },
+    "node_modules/deep-equal": {
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-2.2.3.tgz",
+      "integrity": "sha512-ZIwpnevOurS8bpT4192sqAowWM76JDKSHYzMLty3BZGSswgq6pBaH3DhCSW5xVAZICZyKdOBPjwww5wfgT/6PA==",
+      "dev": true,
+      "dependencies": {
+        "array-buffer-byte-length": "^1.0.0",
+        "call-bind": "^1.0.5",
+        "es-get-iterator": "^1.1.3",
+        "get-intrinsic": "^1.2.2",
+        "is-arguments": "^1.1.1",
+        "is-array-buffer": "^3.0.2",
+        "is-date-object": "^1.0.5",
+        "is-regex": "^1.1.4",
+        "is-shared-array-buffer": "^1.0.2",
+        "isarray": "^2.0.5",
+        "object-is": "^1.1.5",
+        "object-keys": "^1.1.1",
+        "object.assign": "^4.1.4",
+        "regexp.prototype.flags": "^1.5.1",
+        "side-channel": "^1.0.4",
+        "which-boxed-primitive": "^1.0.2",
+        "which-collection": "^1.0.1",
+        "which-typed-array": "^1.1.13"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/deep-equal/node_modules/isarray": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-2.0.5.tgz",
+      "integrity": "sha512-xHjhDr3cNBK0BzdUJSPXZntQUx/mwMS5Rw4A7lPJ90XGAO6ISP/ePDNuo0vhqOZU+UD5JoodwCAAoZQd3FeAKw==",
+      "dev": true
+    },
     "node_modules/deep-extend": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
@@ -8809,6 +9030,23 @@
         "node": ">=8"
       }
     },
+    "node_modules/define-properties": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.2.1.tgz",
+      "integrity": "sha512-8QmQKqEASLd5nx0U1B1okLElbUuuttJ/AnYmRXbbbGDWh6uS208EjD4Xqq/I9wK7u0v6O08XhTWnt5XtEbR6Dg==",
+      "dev": true,
+      "dependencies": {
+        "define-data-property": "^1.0.1",
+        "has-property-descriptors": "^1.0.0",
+        "object-keys": "^1.1.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/del": {
       "version": "6.1.1",
       "resolved": "https://registry.npmjs.org/del/-/del-6.1.1.tgz",
@@ -8922,6 +9160,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/dom-accessibility-api": {
+      "version": "0.5.16",
+      "resolved": "https://registry.npmjs.org/dom-accessibility-api/-/dom-accessibility-api-0.5.16.tgz",
+      "integrity": "sha512-X7BJ2yElsnOJ30pZF4uIIDfBEVgF4XEBxL9Bxhy6dnrm5hkzqmsWHGTiHqRiITNhMyFLyAiWndIJP7Z1NTteDg==",
+      "dev": true
+    },
     "node_modules/domexception": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/domexception/-/domexception-4.0.0.tgz",
@@ -9068,6 +9312,32 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/es-get-iterator": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/es-get-iterator/-/es-get-iterator-1.1.3.tgz",
+      "integrity": "sha512-sPZmqHBe6JIiTfN5q2pEi//TwxmAFHwj/XEuYjTuse78i8KxaqMTTzxPoFKuzRpDpTJ+0NAbpfenkmH2rePtuw==",
+      "dev": true,
+      "dependencies": {
+        "call-bind": "^1.0.2",
+        "get-intrinsic": "^1.1.3",
+        "has-symbols": "^1.0.3",
+        "is-arguments": "^1.1.1",
+        "is-map": "^2.0.2",
+        "is-set": "^2.0.2",
+        "is-string": "^1.0.7",
+        "isarray": "^2.0.5",
+        "stop-iteration-iterator": "^1.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/es-get-iterator/node_modules/isarray": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-2.0.5.tgz",
+      "integrity": "sha512-xHjhDr3cNBK0BzdUJSPXZntQUx/mwMS5Rw4A7lPJ90XGAO6ISP/ePDNuo0vhqOZU+UD5JoodwCAAoZQd3FeAKw==",
+      "dev": true
+    },
     "node_modules/escalade": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
@@ -9635,6 +9905,15 @@
       "resolved": "https://registry.npmjs.org/fontfaceobserver/-/fontfaceobserver-2.3.0.tgz",
       "integrity": "sha512-6FPvD/IVyT4ZlNe7Wcn5Fb/4ChigpucKYSvD6a+0iMoLn2inpo711eyIcKjmDtE5XNcgAkSH9uN/nfAeZzHEfg=="
     },
+    "node_modules/for-each": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/for-each/-/for-each-0.3.3.tgz",
+      "integrity": "sha512-jqYfLp7mo9vIyQf8ykW2v7A+2N4QjeCeI5+Dz9XraiO1ign81wjiH7Fb9vSOWvQfNtmSa4H2RoQTrrXivdUZmw==",
+      "dev": true,
+      "dependencies": {
+        "is-callable": "^1.1.3"
+      }
+    },
     "node_modules/foreground-child": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-3.1.1.tgz",
@@ -9794,6 +10073,15 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/functions-have-names": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/functions-have-names/-/functions-have-names-1.2.3.tgz",
+      "integrity": "sha512-xckBUXyTIqT97tq2x2AMb+g163b5JFysYk0x4qxNFwbfQkmNZoiRHb6sPzI9/QV33WeuvVYBUIiD4NzNIyqaRQ==",
+      "dev": true,
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/gensync": {
       "version": "1.0.0-beta.2",
       "resolved": "https://registry.npmjs.org/gensync/-/gensync-1.0.0-beta.2.tgz",
@@ -9954,6 +10242,15 @@
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       }
     },
+    "node_modules/has-bigints": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/has-bigints/-/has-bigints-1.0.2.tgz",
+      "integrity": "sha512-tSvCKtBr9lkF0Ex0aQiP9N+OpV4zi2r/Nee5VkRDbaqv35RLYMzbwQfFSZZH0kR+Rd6302UJZ2p/bJCEoR3VoQ==",
+      "dev": true,
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/has-flag": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
@@ -9995,6 +10292,21 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/has-tostringtag": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/has-tostringtag/-/has-tostringtag-1.0.0.tgz",
+      "integrity": "sha512-kFjcSNhnlGV1kyoGk7OXKSawH5JOb/LzUc5w9B02hOTO0dfFRjbHQKvg1d6cf3HbeUmtU9VbbV3qzZ2Teh97WQ==",
+      "dev": true,
+      "dependencies": {
+        "has-symbols": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/hasown": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/hasown/-/hasown-2.0.0.tgz",
@@ -10330,6 +10642,20 @@
         "node": ">=6"
       }
     },
+    "node_modules/internal-slot": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/internal-slot/-/internal-slot-1.0.6.tgz",
+      "integrity": "sha512-Xj6dv+PsbtwyPpEflsejS+oIZxmMlV44zAhG479uYu89MsjcYOhCFnNyKrkJrihbsiasQyY0afoCl/9BLR65bg==",
+      "dev": true,
+      "dependencies": {
+        "get-intrinsic": "^1.2.2",
+        "hasown": "^2.0.0",
+        "side-channel": "^1.0.4"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
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       "integrity": "sha512-iBdZ57RDvnOR9AGBhML2vFZf7h8vmBjhoaZqODJBFWHVtKkDmKuHai3cx5PgVMrX5YDNp27AofYbAwctSS+vhQ=="
     },
+    "node_modules/which-typed-array": {
+      "version": "1.1.13",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.13.tgz",
+      "integrity": "sha512-P5Nra0qjSncduVPEAr7xhoF5guty49ArDTwzJ/yNuPIbZppyRxFQsRCWrocxIY+CnMVG+qfbU2FmDKyvSGClow==",
+      "dev": true,
+      "dependencies": {
+        "available-typed-arrays": "^1.0.5",
+        "call-bind": "^1.0.4",
+        "for-each": "^0.3.3",
+        "gopd": "^1.0.1",
+        "has-tostringtag": "^1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/wonka": {
       "version": "4.0.15",
       "resolved": "https://registry.npmjs.org/wonka/-/wonka-4.0.15.tgz",
diff --git a/package.json b/package.json
index bf0f5a3..0080b3c 100644
--- a/package.json
+++ b/package.json
@@ -12,18 +12,19 @@
   "dependencies": {
     "expo": "~49.0.15",
     "expo-status-bar": "~1.6.0",
-    "react": "18.2.0",
-    "react-native": "0.72.6",
     "jest-expo": "~49.0.0",
-    "jest": "^29.2.1"
+    "react": "18.2.0",
+    "react-native": "0.72.6"
   },
   "devDependencies": {
     "@babel/core": "^7.20.0",
+    "@testing-library/react": "^14.1.2",
     "@testing-library/react-native": "^12.4.3",
     "@tsconfig/react-native": "^3.0.2",
     "@types/jest": "^29.5.11",
     "@types/react": "~18.2.14",
     "@types/react-test-renderer": "^18.0.7",
+    "jest": "^29.7.0",
     "typescript": "^5.3.3"
   },
   "jest": {
diff --git a/src/StopWatch.tsx b/src/StopWatch.tsx
index 5c7eb74..93a8a6a 100644
--- a/src/StopWatch.tsx
+++ b/src/StopWatch.tsx
@@ -1,8 +1,146 @@
-import { View } from 'react-native';
+import React, { useRef, useState } from 'react';
+import { View, Text, FlatList, StyleSheet } from 'react-native';
+import StopWatchButton from './StopWatchButton';
 
+
+// Summary. Virtual stopwatch that counts seconds, and displays the number of hours:minutes:seconds.
 export default function StopWatch() {
+  const [currentTime, setCurrentTime] = useState<number>(0);
+  const [on, setOn] = useState<boolean>(false);
+  const [hideTime, setHideTime] = useState<boolean>(false);
+  type lapData = {
+    id: number;
+    lapTime: number;
+  };
+
+  var lapData = useRef<lapData[]>([]);
+  var intervalRef = useRef(0); 
+  var timeRef = useRef(0);
+
+  /**
+   * Function description. Used to start the stopWatch tracked in timeRef, displayed with setCurrentTime by adding one second to timeRef.
+   */
+  const startStopWatch = () => {
+    setOn(true);
+    setHideTime(false);
+    intervalRef.current = setInterval(() => {
+      setCurrentTime(timeRef.current + 1);
+      timeRef.current++;
+    }, 1000);
+  }
+  /**
+   * Function description. Used to pause the stopWatch by stopping the interval change.
+   */
+  const pauseStopWatch = () => {  
+    setOn(false);
+    setHideTime(false);
+    clearInterval(intervalRef.current);
+  }
+  /**
+   * Function description. Used to stop the stopWatch by reseting all states back to initial states. It will hide the timer.
+   */
+  const stopStopWatch = () => {
+    setOn(false);
+    setHideTime(true);
+    clearInterval(intervalRef.current);
+    intervalRef.current = 0;
+    timeRef.current = 0;
+    setCurrentTime(0);
+  }
+  /**
+   * Function description. Used to stop the stopWatch by reseting all states back to initial states. It will not hide the timer.
+   */
+  const resetStopWatch = () => { 
+    setOn(false);
+    setHideTime(false);
+    clearInterval(intervalRef.current);
+    intervalRef.current = 0;
+    timeRef.current = 0;
+    setCurrentTime(0);
+    lapData.current = [];
+  }; 
+  /**
+   * Function description. Used to resume the stopWatch by adding a second to the timeRef every second
+   */
+  const resumeStopWatch = () => { 
+    setOn(true);
+    setHideTime(false);
+    setCurrentTime(timeRef.current + 1);
+    timeRef.current++; 
+    intervalRef.current = setInterval(() => {
+      setCurrentTime(timeRef.current + 1);
+      timeRef.current++; 
+    }, 1000);
+  };
+  /**
+   * Function description. used to add a lap (timestamp) to an array of other laps called lapData.
+   */
+  const addLapTime = () => {
+    lapData.current.push({ lapTime: currentTime, id: lapData.current.length });
+  }
+
   return (
-    <View >
+    <View style={styles.container}>
+      <View style={styles.timeTextContainer}>
+        {!hideTime 
+          ? <Text style={styles.timeText}>
+              {Math.floor(currentTime / 60 / 60).toLocaleString('en-US', {minimumIntegerDigits: 2, useGrouping: false})}:{Math.floor(currentTime / 60).toLocaleString('en-US', {minimumIntegerDigits: 2, useGrouping: false})}:{(currentTime % 60).toLocaleString('en-US', {minimumIntegerDigits: 2, useGrouping: false})}
+            </Text>
+          : <></>
+        }
+      </View>
+
+      <View style={styles.reactiveButtonsContainer}>
+        {!on 
+          ? (timeRef.current != 0) 
+            ? <StopWatchButton title="Resume" onPress={()=>{resumeStopWatch()}}/>
+            : <StopWatchButton title="Start" onPress={()=>{startStopWatch()}}/>
+          : <>
+              <StopWatchButton title="Pause" onPress={()=>{pauseStopWatch()}}/>
+              <StopWatchButton title="Stop" onPress={()=>{stopStopWatch()}}/>
+            </>
+        }
+      </View>
+
+      <View style={styles.constantButtonsContainer}>
+        <StopWatchButton title="Reset" onPress={()=>{resetStopWatch()}}/>
+        <StopWatchButton title="Lap" onPress={()=>{addLapTime()}}/>
+      </View>
+
+      <View style={styles.lapsTimeContainer}>
+        <FlatList
+          data={lapData.current}
+          renderItem={({item}) => 
+            <Text>Lap {item.id.toString()} = {Math.floor(item.lapTime / 60 / 60).toLocaleString('en-US', {minimumIntegerDigits: 2, useGrouping: false})}:{Math.floor(item.lapTime / 60).toLocaleString('en-US', {minimumIntegerDigits: 2, useGrouping: false})}:{(item.lapTime % 60).toLocaleString('en-US', {minimumIntegerDigits: 2, useGrouping: false})}</Text>
+          }
+          keyExtractor={item => item.id.toString()}
+          scrollEnabled={true}
+          data-testID='lap-list'
+          persistentScrollbar={true}
+        />
+      </View>
     </View>
   );
-}
\ No newline at end of file
+}
+
+const styles = StyleSheet.create({
+  container: {
+    justifyContent: 'space-between',
+    alignItems: 'center',
+  },
+  timeTextContainer: {
+  },
+  timeText: {
+    fontSize: 20,
+    fontWeight: 'bold'
+  },
+  reactiveButtonsContainer: {
+  },
+  constantButtonsContainer: {
+    flexDirection: 'row',
+  },
+  lapsTimeContainer: {
+    height: "30%",
+    width: "100%"
+  }
+});
\ No newline at end of file
diff --git a/src/StopWatchButton.tsx b/src/StopWatchButton.tsx
index 8768555..bdb7952 100644
--- a/src/StopWatchButton.tsx
+++ b/src/StopWatchButton.tsx
@@ -1,8 +1,22 @@
-import { View } from 'react-native';
+import React from 'react';
+import { TouchableOpacity, GestureResponderEvent, Text, StyleSheet } from 'react-native';
 
-export default function StopWatchButton() {
+export default function StopWatchButton({ title, onPress, } : {
+  title: string; 
+  onPress: (event: GestureResponderEvent) => void;
+}) {
   return (
-    <View >
-    </View>
+    <TouchableOpacity style={styles.button} onPress={onPress}>
+      <Text>{title}</Text>
+    </TouchableOpacity>
   );
-}
\ No newline at end of file
+}
+
+const styles = StyleSheet.create({
+  button: {
+    alignItems: 'center',
+    backgroundColor: '#66bfad',
+    padding: 10,
+    borderRadius: 20
+
+}});
diff --git a/tsconfig.json b/tsconfig.json
index a7b94da..19f0f70 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,7 @@
 {
   "extends": "@tsconfig/react-native/tsconfig.json",
   "compilerOptions": {
+    "jsx": "react",
     "strict": true
   }
 }