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

Good performer. Magnet will reach over 2 gap and still activate switch.

Perfect switch to be used in a basic DC electronic circuit that detects if the garage door is opened or closed. Provides a visual piece-of-mind that the door is closed,

Very well built. I used this to trigger indicator lights on our driveway gate. Both parts mounted to post and gate with no modifications necessary. The included bracket has plenty of mounting options. I was concerned at first that with the gate being steel if it would affect the magnet, it doesnt. Also, the switch does not have to be mounted as close as possible to the magnet, it will work when the components are about 2 inches apart. Had to mount them farther apart than expected and it still worked fine. The only recommendation I would make to the manufacturer is that the recessed areas to mount the switch be enlarged slightly. The recess is too small to get a socket on a hex head screw making it necessary to use Phillips screws.

Unlike the junk brand I ordered first, this one works.

It works on my garage door. Now I can tell when it is open. Good Product.

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.

Very durable. Utilized for double garage doors to detect (open/close) positions. Connected reed switches in series to controller to operate and monitor garage door utilizing WiFi.

Used it to replace my ADT floor switch that went out. Was nice having the option to use as NO or NC as I didnt know what my existing switch was. Easy to install and work good. I wasnt going to replace the magnet but this one was a lot nicer so I opted to use it.

Had one installed, but it split in half from winter weather freezing it

recieved as expected based on description. OEM would have been a better choice.