Build-in GPS and GSM/GPRS modules - Support GSM 900/1800 MHz. Excellent for fixing the position even at a weak signal status work well even in areas with limited sky view like urban canyons - High sensitivity JRC low power GPS chipset - SOS button send out exact location for immediate rescue/action - Support check location and real-time and historical trajectory by SMS or Internet - Support single location and continuous tracking - Support cut-off electricity and oil function and recovery command - GSM module: MTK program GSM 900/1800 dual-band. Support the TCP protocol - GPS chipset: JRC chipset - Package included: - 1 * GPS tracker device - 1 * GPS and GSM antenna - 1 * SIM card socket - 1 * Power cable - 1 * 2.5mm to 3.5mm adapter cable - 1 * 3.5mm jack earphone - 1 * Software CD