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

Item as listed Worked great.

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

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,

Has three wires black is Colin plus one for normally open and one for normally closed . Even without instructions . Hook up black plus one other and see if it signals it closed with the door closed .

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

this shipped really fast worked perfect and was a more heavy duty design than the one it replaced.

Extremely good quality. This is a robustly built product. I have two in service. Installed with no issues. Flawless operation. Good range of detection l, which eases installation.

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

Worked great for our duckins (ducks and chickens) coop alert. Wired this in to a solar light such that the light is on at night when door is opened so we can see from the house if the coop door is still open before bed. Well made product and would be good for any outdoor reed switch application.