Model RD008J3 Quantity 1 piece(s) Function Turn on automaitically while braking or reversing car anti electromagnetic wave interference full range dection. CPU N/A Detecting Distance 6m Sensor Color Black Sensor Qty. 3 Sensor Diameter No cm Monitor Type No Monitor Size No Working Voltage 10~24V Rated Current 100 mA Ultrasonic Frequency 40 KHz Alarm Volume 80 dB Working Temperature +40'C~+80'C Other Features Dual angle detection wide range humidity-resistance high sensitivity and reliability; License plate frame sensor easy installation; Max power: 4W Certification CE Packing List 1 x Car license plate frame sensor (240cm-cable) 1 x Buzzer (185cm-cable) 1 x Parking sensor 1 x Dual side tape 1 x Iron plate 1 x English user manual