SM-226L-3Q Seco-Larm Overhead Door Mount N.C. Magnetic Contact w/ 3 Wires for N.O./N.C. Applications (One Pack)

replaced a 30 year old alarm switch on the garage. Its 1/2 the size and works well.

Great product for the price

Great solution for monitoring garage doors and other roll up doors. I have used these at businesses as well as on moving trucks.

need a good masonry drill bett

I needed a way to sense the position of my garage door for my remote garage door controller that I am building. Initially thought I could use a simple tilt switch but found it would be more difficult to implement and too bouncy. This is a pretty forgiving switch and works great with my garage door.

I have 2 of these installed on garage doors, unheated space for many years and they have never failed in harsh MN weather, that is why I purchased 2 more for barn doors on a new building.

Great purchase.

This is a great switch. The switch part is both lightweight and extremely tough; the magnet part is easy to mount and also light. The activation distance is around two inches that makes for finding a nice mount point easy. Additionally, the magnet can be reversed on the mount if you need a little more distance for a weird mounting spot. The armored cable protects the signal wires, so if you run over it with the car it will still work. Since it has normally open and normally closed outputs, it will work in any wired alarm application. Really nice device.

10/10 would bang

Fit, on a hole for hole basis with whatever model was there before. Made switching the two a 10 minute job. Back in action on the alarm panel.