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

Excellent product. Far better than the run of the mill magnetic switches I first tried. These are very rugged and well made. I highly recommend them.

Using as a sensor with a Raspberry Pi. Working perfectly so far. Straightforward install.

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.

It worked except below 0 is a problem. When its cold swing a stronger magnet across it. That wakes it up.

MUY BIEN

This was needed to replace a failed magnet switch which Id bought about a month earlier to make an indicator light for my garage door. I wish Id gone this route the first time. This item is very high quality and was easy to install as it is made for this application.

Excellent product.

Not much to say, but its made well, and should last years. As far as wiring, black is common, green is normally open, and red is normally closed. Pretty straight forward...... Well worth twenty bucks......

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.

Use with konnected for home assistant. Works great.