The TTU-2820 high-value tracking unit from CalAmp features a small size, superior GPS performance, an internal 3.8 Ah battery and three Inputs/Outputs (I/O). The TTU-2820 is a complete vehicle tracking and communications device incorporating next-generation, super-sensitive GPS technology on GPRS, CDMA and HSPA cellular networks for installation in any 12 or 24 volt mobile vehicle. Superior internal antennas for both cellular and GPS eliminate the need for wired antennas and make the TTU-2820 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 communications link between the device and your application servers. The TTU-2820 is designed to dramatically reduce cost, power and size while providing excellent field reliability.