Gsm quad-band, gps + gsm + gprs wireless network, high sensitive gps chipset, real-time tracking, built-in gsm & gps antenna, built-in on / off power, wide voltage input range, built-in acceleration sensor for vibration alarm, support acc detection, real-time reporting car status, low battery alarm, tele-cut off (petrol / electricity) function, sos alarm, voice monitor, built-in cpu, eliminating breakdown automatically, three led indicators: gps - blue; gsm - green; power - red, check location via platform