5 reviews for NC Door Sensor Metal Wired Roller Shutter Door Magnetic Contact Reed Switch for Security Alarm System

+1
AliExpress Shopper
Rated 5 out of 5
March 17, 2026
Love this chonker! The huge magnet makes this work so much better than the reed switch modules.
J***z
Rated 5 out of 5
February 27, 2026
Small contactless switch, activates at approx. 3 mm removed. Additional alarm system, opens in case of an alarm - monitoring of the line with 5-20 mA is therefore possible. Metal housing incl. Screws. Thank you for the fast delivery.
AliExpress Shopper
Rated 5 out of 5
October 22, 2025
Wasn't sure if i needed normally closed or normally open door contacts, but am happy to say that these normally closed contacts work perfectly with my aliexpress homesecur tuya alarm 👍
AliExpress Shopper
Rated 5 out of 5
October 22, 2025
Wasn't sure if i needed normally closed or normally open door contacts, but am happy to say that these normally closed contacts work perfectly with my aliexpress homesecur tuya alarm 👍

+4
J***y
Rated 5 out of 5
July 25, 2025
Well packed and received earlier than expected. The items look well built. Comes with screws. The items works well during testing. The detection range is about 55mm.