The high value of the LMU-900 tracking unit from CalAmp features a small size, superior GPS performance, 3-axis accelerometer for motion and tilt sensing, and four inputs/four outputs (I/O). The LMU-900 is a complete vehicle tracking and communications device, incorporating next-generation, high-sensitivity GPS technology on GSM/GPRS/CDMA 1x HSPA RTT cellular networks for installation in any 12 or 24-volt mobile vehicle. Options for internal or external antenna allow the device to be mounted practically anywhere for easy, low-cost installations. Messages are transported over the cellular network using enhanced SMS or UDP messages, providing a reliable communication link between the device and application servers. The LMU-900 is designed to drastically reduce costs, power, and size while providing excellent field reliability.