Vcc : 3.3 to 5 Vdc Supply Input Gnd : Ground Input Out : Output that goes low when obstacle is in range Power LED : Illuminates when power is applied Obstacle LED : Illuminates when obstacle is detected Distance Adjust : Adjust detection distance. CCW decreases distance. CW increases distance. IR Emitter : Infrared emitter LED IR Receiver : Infrared receiver that receives signal transmitted by Infrared emitter.