These window door contact sensors are exactly what I needed to keep my home safe and secure. They were incredibly easy to install and the instructions were clear and concise. I also appreciate the fact that they come in sets of six so I can place them on every window and door in my home without worrying about missing any. The magnetic reed switch works like a charm and provides reliable, fast-acting protection. The fact that they are normally closed ensures that no sneaky burglars can bypass my security system undetected. I highly recommend the MC-33C Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch to anyone looking for top-notch security sensors for their home or business. 5 stars all the way!
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