GF-21 Mini GPS Tracker Voice Activated

Real-time Track, Tracking History, Smart Sleep, Movement Alert. When the Current Power Is Lower Than 20%, Gf-21 Will Send Alarm Information to You. Dial the Sim Card Number and You Will Hear the Sound Around the Tracker. With No Light and No Noise. For Emergency, Press the Sos Button and the Device Will Send Out the Call and Message for Help to the Guardian.