Just installed these RC-36 sensors around my apartment and wow - they're actually pretty great for the price!

The white ABS plastic casing looks clean and blends well with my window frames. Installation was super simple - just screwed them in place and connected the wires to my existing alarm system.

What surprised me most was how sturdy they feel despite being plastic. The magnets have a strong hold and the wiring seems durable. I tested them by opening/closing windows repeatedly and they triggered consistently every time.

Only minor complaint - the wires could be a bit longer for some installation spots. But at this price point for 10 pairs, I really can't complain!

Would definitely recommend if you need basic but reliable door/window sensors. They do exactly what they promise with no fuss.