GF21 GSM Mini GPS Tracker Real Time Tracking Locator

Anti-disturbance mode : once the no-disturbance time range is set through the app on the guardian's cell phone, this voice recorder will shield the voice messages and calls. electronic fence :when you center on device to define an area on the map, it will immediately alarm if the tracker is away from the area. low battery alarm: when the current power is lower than 20%, the voice recorder will send alarm information to you other remote functions: find the tracker, alarm, shutdown, restart.