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

Very high quality alarm contact with an all metal body and nice metal wrapped cable. I’ve used many of these in my past job and never had one fail in and industrial or residential application. It’s definitely one of the highest quality alarm components I’ve encountered. I would recommend it to anyone who wants a rugged contact. I’ve paired them with the dry contacts on Honeywell wireless sensors to create a wireless option as well.

Good quality unit

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

So, 5 stars for quality, but yikes, $20 for a magnet sensor, so 4 stars for value. Anyway, I bought a Nexx garage door wifi control which is just a repurposed $5 Sonoff control with a very cheap magnetic sensor for reporting door position, but it also has a fairly good app (so you pay for the app I guess). Read the reviews on the Nexx, a large number talk about it working and then not, becaue the position sensor stops reporting correctly. and thats because It needs an 1/8 gap on a garage door. On my wobbly old door youre never going to get that consistency; so Sentrol to the rescue with their 2 inch gap. This sensor is industrial quality. Buy a LeMotech ABS Plastic Dustproof Waterproof IP55 Junction Box, cut the cord on the cheap magnet, and splice it into the Sentrol inside this box. Two day shipping, problem solved. Oh, and use the black and green wires from the Sentrol for this application.

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

Just what I needed for my barn roll-up door. Well pleased with all phases of my purchase.

Perfect. Using for my Insteon home automation....they used to include this exact item in their garage door kits but have since cheaped out. I ordered this to match the one Ive had for several years when I wanted to add HA control to my second door.

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.

I wish I had found this years ago. This works perfectly on the top edge of my garage door