Hey DIY home security folks! These magnetic reed switches are exactly what you need to set up a proper security system without breaking the bank. They're the same type of sensors used in professional alarm systems, but at a fraction of the cost.
You get 4 complete sets in this package, each with screws included for easy installation. The specifications are pretty impressive: they handle switching voltage up to 300V, have a gap of ≥15mm (meaning the magnet and switch can be up to 15mm apart and still work), and come with about 250mm (9.8 inches) of 24 AWG cable.
What's really cool is the output options - you get both normally closed (NC) and normally open (NO) configurations. For those not familiar with the terms: normally closed means the circuit is complete until the magnet moves away, while normally open means the circuit is open until the magnet comes close. This flexibility means you can integrate these with pretty much any security system or smart home setup. They're perfect for doors and windows, and super easy to install. Just mount one part on the frame and the other on the moving door/window, wire them up, and you've got instant security monitoring!
Free 30-day returns 
Free 30-day returns
