The main features of Circle as followed: A. Panic mode, the 95 dB alarm beeps from Circle to keep danger away from users B. Silent mode, ask people for help in silence. The above two modes, send out SOS messages with GPS locations in every 8 seconds to 3 people Other features of the Circle: A. Anti-lost, we have the longest range of tracking ability in the market as up to 100 meters. B. Wireless selfie remote controller, the users can use the Circle as a remote controller to shoot photos or videos. C. Last lost locations recorder, when things are out of tracking range that users do not notice at that moment, they can come back to check in the app where it was lost.