Features:   1. It needs a password to make and change any setup, protect your privacy. 2. Real-time tracking, show location information automatically. 3. Built-in switching power supply, wide voltage input range (suitable for all cars). 4. It can accurately position even when the signal is weak. 5. Receive instructions and real-time location information via SMS. 6. Three-color LED status display.  Specifications:   Color: Black Size: 90x45x16mm/3.54“x1.77”x0.63"   3LED Indicators: GPS-blue, GSM-green, Power-red GPS Module: SIRF Star III/LP Working Humidity: 45% to 80%RH GSM Frequency: 850/900/1800/1900MHz GPS Channels: 32 Tracking Sensitivity: -159dBm Acquisition Sensitivity: -144dBm Hot Start: <2sec (open sky) GPRS Frequency: Class2, TCP/IP built-in GSM Module Warm Start: <15sec (open sky) Cold Start: <38sec (open sky) Power Input: 9-36V DC Function Buttons: Power/SOS The 2G Simcard which supports GPRS will be supported in this device Working Temperature: -10 to 60℃ Antenna: Built-in GSM, GPS antenna with low noise and high gain  Notes: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-3mm measuring deviation due to manual measurement.   Packing list:    1 x GPS tracker 1 x Bunch of cable 1 x User Manual 4 x Screws