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

Worked great

Works as expected. Used it to automate my garage door with a Raspberry Pi. Now garage door knows position when I give the command to open or close vs just actuate.

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.

Solid piece of work.. was easy to use to set up mu open garage door alarm/ light.

I have 4. Two can be wired different. Either n/o or n/c depends on which wires you use. They all work great.

Great product and I will definitely buy it again because there is no alternatives.

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

Perfect!

Installed and works perfectly. Mounting bracket for the magnet leaves lots of options. I moved the magnet on all three and trimmed the bracket on two. East to make work for my doors. I installed them on the top of the door with the contact on the overhead door opening.

Switch can not handle the wattage that it says. First time I hooked it up the reed switch welded itself closed.