Features and Specification: GPS + LBS GPS Chipset: Skytraq GSM Chipset: Quad Band 850/900/1800/1900 MHz Support setting 3 authorized cell phone numbers Track on Demand, time Interval Power saving mode SOS button for immediate rescue and alarm Two-way Audio Two quick dialing buttons for 2 preset phone numbers Geo-fencing alarm Over speed limit warning Built in Speaker and Microphone Motion Sensor "No GPS" warning Background voice surveillance Low Battery warning Support Data Logger (Built-in Memory) Color:Black (as pictutes shown) Weight: 132g Dimension:8.2 x 4.2 x 1.8 Approx Package Content: 1 x GT-89S Personal Tracker 1 x power adapter charger 1 x CD 1 X li-ion Battery 1 x USB cable