The high value of the LMU-300 tracking unit from CalAmp features superior GPS performance, a small footprint, an internal 200 mAh backup battery option, ultra-low power modes for sleep, a 3-axis accelerometer for motion sensing, and a maximum of two inputs/one output (I/O). The LMU-300 is a vehicle tracking and communications device that incorporates next-generation, super-sensitive GPS technology on GSM/GPRS cellular networks for installation in any 12/24-volt mobile vehicle. Internal antennas and quality for cellular and GPS eliminate the need for cable antennas and make the LMU-300 easily mountable in practically any location on the vehicle, with low-cost installations. Messages are transported over the cellular network using either SMS or UDP messages, providing a reliable communication link between the device and application servers. The LMU-300 is designed to drastically reduce cost of ownership, power, and size while offering excellent field reliability.