Reflective photoelectric switch is a switch based on optical principle, which is composed of emitter, detector and reflector. When the light beam sent by the emitter is reflected by the reflector to the detector.The detector will detect the light emitted by the emitter and feed back the signal to the control system to realize the switch function with high reliability.High radiation intensity, fast sensing speed, and strong sensitivity can be used in mouse, printer, copier, induction faucet and other application fields.