Built-in GPS personal locator. GSM/SMS communication or GPRS UDP connection Supports quick dialing buttons for 2 preset phone numbers SOS button sends out exact location for immediate rescue/action Compact size, easy to carry, hold and hide Specifications: Type: GPS Tracker GSM Chip: 850/900/1800/1900 Mhz GPS Sensitivity: -159DB GPS Frequency: L1, 1575.42 MHz Accuracy for Location: 5m, 2D RMS Accuracy for Speed: 0.1m/s Time to First Startup: Cold Status 45s, Warm Status 35s, Hot Status 1s Altitude Limit: 18,000 meters (60,000 feet) max Velocity Limit: 515 meters/second (1000 knots) max Vibration Limit: 20m/second Operation Temperature: -20C to +55C Humidity: 5% ~ 95% Non-condensing Car Charging Voltage: 12-24V Input, 5V Output Handheld Charging Voltage: 110220V Input, 5V Output Standby Time: around 150 hours (with Sleep Mode) Battery: Rechargeable and Changeable 3.7V/850mAh Li-ion Battery Charging Port: DC 5V (Mini USB Port) Color: As Shown Material: ABS Package Contents: 1 x Car Locator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.