LED Parking sensor left, middle, right obstruction detecting, 3 ... you get out of the effective rage of the car with smart key, commonly speaking,1.5M to 2M, ... restart ARM condition.8.Shock trigger alarm.Under ARM condition, if the car system received shock signal, the ... times. Within 10 seconds, if the car be shocked again, car alarm will continue sounding. CAR ALARM SYSTEM(one way/two way available)