PowerBand is an app for sports and fitness. It can get users'daily movement steps, sleep and heart rate status by connecting with the bracelet. The hidden permissions involved are only temporary access without caching user data, so as to prevent your information from leaking, destroying and losing. The permissions used include: 1. Geographic Location Permission: It is necessary to obtain weather forecast and Bluetooth function. 2. Telephone privileges: The combination of the bracelet and PowerBand to reject calls needs to be used. 3. Address Book Function:Call reminder, need to display the name of the call to the ring, need to use.