Hey DIY security folks! This 4-pack of magnetic reed switches gives you an affordable way to secure your home, office, or shop without complicated installation. These are normally open (NO) type switches that work up to 10mm apart - when the magnet moves away from the sensor, the circuit opens and triggers your alarm system. Made from durable ABS material, these white sensors are discrete and reliable for detecting when doors or windows open. The package includes both the sensors and magnets, so you've got everything needed for four separate openings. Installation is super simple - just mount the sensor on the frame and the magnet on the moving door/window, then wire it to your alarm panel. They handle up to 100V and 0.5A, with 10W max power - perfect for most security systems. Besides basic security, you can get creative with home automation too - like turning on lights when a door opens, or getting notifications when someone enters a room. The surface mount design means no drilling complicated holes, and the small size (about 1.14 x 0.59 x 0.35 inches) makes them easy to hide. Pro tip: make sure the sensor and magnet are properly aligned during installation for reliable operation. These work great in homes, hotels, computer rooms, retail stores - anywhere you want to monitor access. The build quality feels substantial, not flimsy like some cheap sensors, and they've got a clean professional look. Whether you're building a full security system or just want to monitor a few specific doors/windows, this 4-pack gives you plenty to work with. It's amazing how much peace of mind these little devices provide, and since they're so affordable, you can secure multiple entry points without breaking the bank. Seriously, for the price, you're getting reliable security components that just work!
Free 30-day returns 
Free 30-day returns
