Welcome to our store！</br>1、Magnets are usually close to each other, which is normal. 2、Close = short circuit = create a path for the current. 3、The magnets are close together and the switch is off. 4、And the switch and magnet are separated, and the switch is open. 5、No external power supply is needed, and the GND and N.C ports of wired or wireless alarm control panel are directly connected. <span style="font-size:16px;font-family:Arial;"><strong>Features:</strong></span> <ol> <li> <span style="font-size:16px;font-family:Arial;">Magnets are usually close to each other, which is normal statement.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">Close = short circuit = create a path for the current.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">The magnets are close together and the switch is off.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">And the switch and magnet are separated, and the switch is open.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">No external power supply is needed, and the GND and N.C ports of wired or wireless alarm control panel are directly connected.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">Not suitable for iron doors, it will reduce the magnetism of the sensor.</span> </li> </ol> <span style="font-size:16px;font-family:Arial;"><strong>Specifications:</strong></span> <span style="font-size:16px;font-family:Arial;">Working Distance: 15mm + 5mm</span> <span style="font-size:16px;font-family:Arial;">Switching Pressure: 100VDC</span> <span style="font-size:16px;font-family:Arial;">Load current: 300 mA</span> <span style="font-size:16px;font-family:Arial;">Life: 1 million times</span> <span style="font-size:16px;font-family:Arial;">Switch Output: NC (Normally Closed)</span> <span style="font-size:16px;font-family:Arial;">Package Weight: 91g/3.2oz</span> <span style="font-size:16px;font-family:Arial;"><strong>Package List:</strong></span> <span style="font-size:16px;font-family:Arial;">10 Pair * Door Window Sensor</span> Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>