Magnetic Reed Switch NC Surface Mount Wired Door Window Contact Sensor with Adhesive Paper for Home Security and Burglar Alarm Systems MC-38 5pcs

I recently installed these sensors for a remote garage door project, and I’m really impressed with their performance. These sensors (MC-38 model, 5-pack) are exactly what I needed. The sensors come with adhesive paper, so you can easily mount them on doors or windows without any drilling or hassle. I used the adhesive to install the sensors and everything stuck securely in place. The wires are long enough to give you flexibility on where you want to connect them, and the surface mount design makes it easy to attach them to any flat surface. The magnetic reed switch works flawlessly. When the door opens, the circuit breaks, triggering action. The response time is quick, and I’ve had no issues with false triggers or malfunctions. The build quality is solid for the price. The sensors are compact yet durable, and the adhesive backing holds up well over time. I’ve had them installed for a few months now, and they’ve remained firmly in place, even on a garage door that is opened and closed frequently. For a 5-pack, the price is fantastic. These sensors offer excellent value considering the price point.

I purchased the NC version of these switches. (ie: Normally Closed with magnet near the switch.) These fit the bill and were exactly what I needed. The small size made them easy to install discreetly. There wire leads were long enough to work with (I needed to extend them with additional wire, but they were easy to connect with butt-connectors (crimp style). Switch is reliable and the magnet is strong enough to be able to activate the switch even when not touching. Screws are provided for affixing to most surfaces, however on my PVC (plastic) window frames, the self-adhesive backing is VERY strong and adheres well. (Just make certain to clean the surface with rubbing alcohol to remove any dirt and oils. NOT windex, that leaves a film... only alcohol will work.) --- Three purchases of this item so far! If I need more, I'll be back.

Used with "Home Assistant" to sense whether or not the garage overhead door was open. Wired into a Shelly relay, and now I can see door state, and open/close door with phone app or Home Assistant. Works great.

Terrible wire..... switch works so far.

Replaced six windows and used these new sensors. Seamlessly integrated into the alarm system, size makes them unobtrusive. Good value for the money

Replaced a few magnetic sensors that had failed. So far, working well. No false alarms.

Sent the wrong size and type. Returning. Very cheaply made.

These switches do work, but they are highly unreliable. I put them on a garage door to identify when the door is open and when it is closed. Both switches are mounted <1/8" from the magnets, but I constantly get notified that the door is open when it is closed and closed when it is open through my home automation system. These were only installed to allow my garage door controller to work, the RATGDO. Already looking for a replacement.