Gufasotre 5pcs Recessed Door Contacts NC Security Alarm Window Sensors With Magnetic Reed Switch. ¾” Door Contact Position Switches (DCS) Work with All Access Control and Burglar Alarm Systems (White)

I've used these on a number of exterior and interior doors in our home. They are easy to install and work well with our Ademco system (Honeywell). I like that they blend in and are barely visible on our white doors. You may have to remove/reinstall a bit of moulding, but that is fairly simple. I didn't have to do that on a couple of our doors.Good value.

Of the 5, 2 did not work at all. The other 3 have been fine.

Great product fast delivery

I bought the 5 pc set. I tested all 5 prior to install, thank goodness!! 1 of the 5 was defective, right out of the box!! That's a 1 in 5 failure rate! Don't you test your products before packaging/selling?

Worked like a charm.

Good product