♦Magnetic Proximity switch is widely used in automation control, alarm system, output ON/OFF signal depending on the position of equipment. ♦Surface switch can be mounted with screws or double side tape , flush switch can be mounted in hole to keep covert . ♦Switching type definition: NO: Normally open, switch ON when magnet nearly. NC: Normally close,switch OFF when magnet nearly . [customizable] NO&NC: 3 wires output, both with NO&NC. [customizable] ♦Please do not knock switch when mounting.