... sensitive SIRFIII Star GPS Chipset and advanced multi-band GSM module Remote control via mobile phone or computer; Excellent locating capability ... and trailer etc.Special and Unique:Connect to RFID Reader, Cameras, LCD, Printer, DVR,etc. Mileage calculation function With Flash ... LEDs indicates GSM signal, GPS signal, power on and GSM module, charge LEDsButton(not in the basic version)2 buttons, report ...