1Sturdy Construction: Made of iron, this magnetic switch is robust and high temperature resistant, avoiding deformation and ensuring a long lifespan. 2Enhanced Control: The normally closed design of this reed magnetic switch switches on (light on) when the switch is near the magnet and turns off (light off) when it is separated from the magnet for precise control. 3High Accuracy: The NC door window reed switch offers a transmission distance of 10 to 20mm, providing quick response and accurate detection. Suitable for every detailed situation. 4Powerful Performance: The recessed door magnetic switch controls the voltage to AC220V when the magnetic door is powered, and load current must not exceed 500mA, ensuring the safety of usage. 5Versatile and Easy Installation: The door sensor reed switch is designed for all door access and alarm systems, it can be installed on wooden or aluminum alloy door and window. Suitable for various installation situations. 2 x Pairs of Magnetic Reed Switch