5,) apk available fitness tracker, firyawee smart watch for android. Bluetooth le heart rate monitor android application that tracks data coming from a heart rate monitor following the bluetooth le generic attribute profile (gatt). The app will take a second to pair, and then you will begin seeing your heart rate displayed in the top left corner of the app. Instant heart rate is an invention from azumizo and is best known for its user interface and simple operation. Anytime, anywhere, across your devices.