... System. 2.Front detection delay time: 8 second. 3.Three Color Mini LED Display. 4.Buzzer Type. 5.Dual CPU, 6 sensors ... .12.Alarm voice: >80dB.13.Ultrasonic frequency: 40KHz product name:car parking sensor system,P1168B,auto parts,car accesscories,led,car parking sensor, parking sensor,auto parking sensor