JIMILOT AT4 Assets Tracker 10000mAh Battery GPS Locator 2G Waterproof Car Tracking DeviceNotice 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