_x000D_ Notice before buy JIMIMAX AT4 Assets GPS Tracker A): Please kind note the AT4 assets locator need to input a SIM card cost 7-15MB data per month. B):. Our AT4 tracker is a 2G GPS tracker only suit for 2G SIM card, if no GSM network in your market, plz buy our 3G trackers 4G version JM-LL301 or LL01 Why Concox AT4 gps tracker? 1). Voice Monitoring We can use preset SOS number to send command MONITOR# to our AT4 . Our AT4 GPS tracker would automatically call you back in a second. Pick up and monitor the voice inside the vehicle. 2). Super Long Standby 30 Days Our AT4 have built-in chargeable and changeable 3.7V 10000mAh Li-ion battery and intelligent dormancy function. One-time charging lasts nearly 30 days( drive for 2 hours per day, in Mode 1: T1=10s, T2=3600s), no need to charge tendiously. 3). IPX5 Dust And Waterproof Our AT4 asset GPS tracking device have super water-resistant to ensure stable operation in tough environment. It is not only effectively prevent dust from entering, but also don't worry about being splashed by water. 4).Vibration Alarm Our AT4 car tracker have a 3D acceleration sensor. When an abnormality occurs in your car, for example, if someone collide, smash or scratch the car, the device will send a telephone alarm to find the corresponding person in time.