Wireless magnetic GPS tracker UM666a is the world easiest installation device that you just find a covert place in vehicle, put it there and leave it working. No wire connection! No need power supply! With built-in battery and GPRS reporting to server at 12hrs, the device working time last up to 3 years (36 Months=1095 Days). Also, it has Detach Alarm, if the device is moved away from current place, it will also sends out alarm to authorized phone number. It is best for tracking goods, vehicles, assets, containers, etc.