The LMU-325 high-value tracking unit from CalAmp features a small footprint superior GPS performance, an internal 200 mAh back-up battery, ultra low power sleep modes, 3-axis accelerometer for motion sense, and two inputs/one output (I/O). The LMU-325 is a complete vehicle tracking and communications device incorporating next-generation, super-sensitive GPS technology on GSM/GPRS cellular networks for installation in any 12/24 volt mobile vehicle. Superior internal antennas for both cellular and GPS eliminate the need for wired antennas and make the LMU-325 mountable virtually anywhere in the vehicle for easy, inexpensive installations. Messages are transported across the cellular network using enhanced SMS or UDP messaging providing a reliable communication link between the device and your application servers. The LMU-325 is designed to dramatically reduce cost of ownership, power and size while providing excellent field reliability.