... engine on/off ·Cut off the engine power Gradually and safely when in urgency ·GPRS(TCP/UDP), SMS Support ·OTA, upgrade ... /1800/1900 Mhz)GPS chipsuper sensitivity and high accuracyLED3LEDs indicate power, GSM, GPS signal, and trembling status( 2 Changer Light ) ... , 2 analog inputs auto GPS /GSM/GPRS/AGPS tracker, engine on& off, geo-fence control,over speed&low power alarm, mileage calculation