Built-in SIRF Star III chipset excellent for fixing the position even at a weak signal status - Work well even in areas with limited sky view like urban canyons - Built-in GSM/GPRS module support 4-frequency GSM 850/900/1800/1900 MHz - Working all over the world - Support voice call two-way talking communication - SOS function - Real-time locating and tracking support SMS communication or GPRS TCP connection - Get the position information via mobile phone SMS or examine the path on the Internet - The available SMS takes the control command change tracing function or switch GPS - Excess speed alarm - Low-battery alarm - Built-in rechargeable 870mAh lithium battery - Package included: - 1 * GPS tracker - 1 * USB cable - 1 * 100V~240V AC adapter (US plug) - 1 * Neck strap - 1 * English user manual