Alright DIY home security folks, these magnetic door and window sensors are exactly what you need to beef up your security system without breaking the bank. This 5-pack gives you enough to cover your main entry points - front door, back door, and a couple of windows. The MC-32 model is recessed, meaning they install flush into your door/window frame for a cleaner look. They work with pretty much any alarm system out there - just wire them into your existing setup. You get both NC (normally closed) and NO (normally open) options in one unit, which is super flexible for different system requirements. The trigger range is 15-25mm, so they need to be installed within that distance to work properly. The wiring is straightforward - red for NC, black for NO, white for common - with about 10 inches of cable to work with. Rated for 100V and 500mA maximum current, so they're for signaling only, not for directly powering lights or heavy loads. The ABS material is fire-resistant and durable for long-term use. Installation is pretty simple if you're comfortable with basic wiring - just drill the holes, run the wires, and secure them in place. Perfect for wooden doors and windows where you can easily recess them into the frame. The set of 5 means you can secure multiple entry points in one go. Seriously, for the price, these are way cheaper than buying individual sensors from security companies, and they work just as well for basic door/window monitoring.