Features: 1.Alarm: Connect the ACC line and enable the ACC ON alarm function. Then the unit issues an alarm when the vehicle exceeds the set speed limit and the device is powered off. 2.Realtime Tracking: You can query the real time location of the device via platform, mobile APP and SMS, and it can count your travel mileage. 3.Geo Fence Alarm: You can set Geo fence on the map, when the vehicle enters or exits the Goe fence, it will generate an alarm. 4.SOS Alarm: When an emergency occurs while driving, the driver can send alarms through the SOS button, and remote cut off the fuel once the car was stolen or meet some emergency. 5.Two Way Calling: You can use your phone to dial the number of the device to listen, and you can also have a two way conversation with the driver. specification:Item Type: Car Tracking Device Material: ABS GSM Band: 850/900/1800/1900Mhz Tracking Sensitivity: -159dBm Accuracy: 5-10m First Restoration (open air): Cold time is 35-90s; Hot state time is 15s Operating Temperature: -10C to +65C Battery: 200mAh lithium battery (build in) PackageList:1 x Alarm Device 1 x Manual 1 x 4 Pin Power Cable 1 x Relay 1 x Relay Cable 1 x Double Sided Sticker 1 x SOS Line 1 x Microphone 1 x Card Retriever