Feature●This magnetic proximity sensor is SMD (double sided tape) and easy to install just stick on●Proximity sensor with good abrasion resistance and lead switch operated by permanent magnets●This magnetic proximity sensor is perfect for opening and closing detection, such as doors, and is the best choice for protecting your family●The switch pattern is NC (normal close type) and when the magnet approaches the switch, the circuit is connected●This magnetic proximity sensor is easy to install and reliable performance. If you have any questions, please feel free to contact the sellerDescription This magnetic proximity sensor is SMD (double sided tape) and easy to install just stick on.