Our app uses the BLE (Bluetooth low energy) beacon functionality in smartphones to detect whether another phone with the app is within 3 meters distance, in which case both phones will exchange and record user IDs. If a user tests positive for COVID-19, he/she will notify the app, which will then send a push notification to all other phones on record in the past 2 weeks, urging their owners to be tested. The app will also update a public heat map detailing the places the affected user has visited in the past 2 weeks.

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