2 PCS Wired NC Aluminum securityreed Magnetic Sensor Door Contacts w/Screws

Note: please read the following carefully to ensure that the product is what you are looking for. Thank you How to distinguish between Recessed NO Magnetic Window and Recessed NC Magnetic Window？ The Recessed Magnetic Window is composed of a reed switch and a magnet. 1. The reed switch is normally open（NO）. When there is no magnet approaching, two small pieces of magnetic reed are disconnected; when the magnet is close, two small pieces of magnetic reed are connected. This is a normally open Recessed Magnetic Window（NO）. Switch Pattern:normally open (NO), when the door(magnet) closed, the switch keeps connecting 2. The reed switch is normally closed（NC）. Two small pieces of magnetic reed are connected when there is no magnet approaching. Two magnets are separated when a magnet approaches. This is a normally closed Recessed Magnetic Window(NC) Switch Pattern:normally closed (NC), when the door closed, the switch are separated. Features: Pattern：normally Colosed(NC), when the door closed, the switch don't keep connecting Size: Part A: 50mm x 18mm x 10mm; Part B: 50mm x 18mm x 10mm; Alarm time: 5 seconds Material: aluminium alloy Output：COM/NC Operating Current: 500mA Application: Mainly used for roller shutter/rolling door; also applied to other doors and windows Installation: Stick part A (magnetic bar) on the edge of the roller shutter/rolling door, and stick part B on the fixed frame of roller shutter/rolling door