5 Pack Magnetic Contacts Switch Window Door Sensor for Alarm System NC 3/8"

Very simple to install and they work just fine. There is nothing fancy about these and they are just simple, cheap replacement contacts that anyone can install. If you need to replace a few of these at your home you can easily do it yourself instead of paying an alarm company to do it for you.

Had to replace a few contacts because lighting burned some of ours. These worked perfectly, easy to install. Would definately recommend.

These contacts were perfect. They easily fit my door frame for my home alarm system. Along with a quick electrical connection and I was good to go at an outstanding price. Plus I ordered them on Tuesday and they were in my mailbox on Wednesday US postal delivery.

Worked perfect for our alarm system.

Great Value... alarm service wanted to charge for a service call and probably $20 bucks just for one, when it's a matter of splicing two wires on one end, and the new magnet on the other, and then have some left over for the next time!

Worked as expected

The switch is very sensitive, responding to the magnet decisively. The description of the product includes the notation "NC", meaning normally closed - ? The switches I received are "NO", normally open.

Solved alarm problems…,,no more false alarms