... ·Roaming feature to save cost ·Control or detect the car doors/engine on/off ·Cut off the engine power Gradually and safely when ... indicate power, GSM, GPS signal, and trembling status( 2 Changer Light )MicrophoneyesHot start1 sec., averageWarm start38 sec., averageCold start42 sec., ... , 2 analog inputs auto GPS /GSM/GPRS/AGPS tracker, engine on& off, geo-fence control,over speed&low power alarm ...