NC NO Magnetic Contact Switch Door Sensor Wired Metal Roller Shutter Door Home Alarm System with 2Pcs Screws

Exquisite workmanship, high efficiency, stable working performance. Premium material ensures maximum strength and durability for long lasting usage. Normally open type: When the magnet and the reed switch are together, they are in the off state NO. NC NO Magnetic Contact Switch Door Sensor Wired Metal Roller Shutter Door Home Alarm System with 2Pcs Screws brand new and high quality Features: Exquisite workmanship, high efficiency, stable working performance. Premium material ensures maximum strength and durability for long lasting usage. Normally open type: When the magnet and the reed switch are together, they are in the off state NO). Normally closed type: When the magnet and the reed switch are together, they are in the on state NC). Used for Non-metal door/window for protection External power supply, connect to wired or wireless alarm control panel. Magnetic Switch only, other accessories demo in the picture are not included Tips: 1. Please do not use the door magnet to directly po