GSM trackers are a great way to track where you have driven or where your car has been. It can be great help when your car is stolen or when you just want to keep an eye those untrustworthy drivers at your business. It supports TCP protocol and GSM frequencies 850 900 1800 and 1900MHz. Internally is a highly sensitive JRC chipset and a GPS sensitivity of -164dBm with a GPS frequency of L1 1575.42MHz. - GSM module MTK program - Supports 850/900/1800/1900 MHz - Supports TCP protocol - High sensitivity JRC GPS chipset - GPS sensitivity: -164dBm - GPS frequency: L1 1575.42MHz - Voltage: DC 12~24V - Package includes: - 1 x GPS tracker device - 1 x Antenna - 1 x Power cable - 1 x Control cable - 1 x Earphone - 1 x SIM card socket - 1 x Software CD