Features:SMS and GPRS dual mode or switch; Real-time location tracking.Vibration alarm, handset search function and cross-border alarm.Electronic fence, you can set a fixed area, it will alarm if pet is beyond this fixed area.Shift alarm: The tracker will set up defense when it stops. Once it is shifted, it will alarm by sending message to the authorized number.Overspeed alarm: You can set up a speed range to monitor the target. It will alarm if the target speed is over the set speed.