4-light pillar displaying distance with digital

Main features
*Auto activate when engage the reversing
*Two / Four detector available , all-round detecting ;
*Display in blue , Orange , red , LED display in Left / Right Obstacle ;
Specification :
*Working voltage : 12 V
*Working temperature : -20-?85
*Detecting range : 0.3-1.5m
*Voice volume : >=73dB