Magnetic Door Contact Switch 3Pin

From the shop's description

Wired Magnetic Door Sensor: Detects door gap opening, Can Be used to detect door, window, or drawer if it is opened or moved. It is widely used for monitoring and security systems, with high reliability, small size, easy installation and operation and strong flexibility. ABS Housing White Garage Door Magnetic Door Contact Switch: Normally Close & Normally Open &Common (3 Pin) Color White Rated current: 500(mA) Rated voltage : (VDC)100 Operating distance: more than 15mm, less than 25mm Rated power: 3W size: 64*13*13mm