AutomaticallyactivatedwhenreversingTheclosertheobstacleis,thefasterthealertbeepingfrequencyistoindicatethesafetyzone,cautionzoneanddangerzoneBuilt-Inside4stageswarningbuzzer3color(blue/violet/red)backgroundchoiceDigitalLCDpaneltoshowdistanceVolumeadjustableforhight,loworoffindicationofthedirectionofobstacleDetectingDistance:0.4-2.0m