Make sure this fitsby entering your model number. Detection range from 0-80cm/0-31.5in can be adjusted flexibly according to different occasion Low-power consumption for long service life Transmitter and receiver are a common body can be installed in one side It can prevent human,children and small pets crush event effectively Perceive the lower part of the 800mm/31.5in in the vicinity of the personnel and pet and issue the relay contact signal timely