Gf21 Realtime Tracker

Real-time tracking, historical track, vibration burglar alarm, electronic fence, built-in strong magnetic, multiple power-saving modes, low-power alarm, remote switch machine. sos call for rescue: in an emergency, press the sos button, that is to send a call and information to the guard for help. device loss can be found through mobile app. pedometer: to measure the users of the walking data. alarm clock: set by w?chter handy app. two-way call: address book number of calls with user.