... vehicle and etc.Capability feature:Adopt industrial grade communication module group, 50 channels positioning, Work at 8-36V ... connect,resist static,electromagnetism compatible,vibration endurable.Relevant accessories:GPS Main Device, GPS Antenna, GSM Antenna, Power Supply cable, Panic ... unwittingly or by act of man, it will send a GPS open circuit alarm to surveillance center.Overspeed alarm:when ...