The high value of the RMU-900 tracking unit features a small size, superior GPS performance, 3-axis accelerometer for motion and tilt sensing, ultra-low power modes, and four inputs/four outputs (I/O). The LMU-900 is a complete vehicle tracking and communication device that incorporates next-generation, high-sensitivity GPS technology on GSM/GPRS/CDMA 1x networks, HSPA RTT cellular networks, and for installation in any 12 or 24-volt mobile vehicle. Internal or external antenna options allow the device to be mounted virtually anywhere for easy, 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-900 is designed to drastically reduce cost, power, and size while providing excellent field reliability.