rearview system 1)competitive price,fast delivery,warranty 2)alarm by three-step bibi sound 3) Left and right obstacle indicatior. 4) Numeral display from 2.0m to 0.4m. 5) 2,3,4 ,6,8 sensors available. 6) Luminous sensors for option. Reverse radarparameter: voltage 10.5DCV-16DCV Rated voltage 12DCV Power cost Max 1.5W Respond distance 0.4m-2.5m Alarm distance 0.4m-2.5m error -10mm, +1mm Display mode --- lsb 0.1m Sensor diameter 22mm Install mode drill Sensor angle XY60 work temperature -30---+80 Alarm type Buzzer (Bi Bi.) alarm volume 65dB Alarm frequency 1.6-2.0mwhisht1.1-1.5m1 HZslowness 0.6-1.0m:3 HZcommonly 0-0.4m7HZhurry