Estone&reg; 220V Recessed PIR Ceiling Occupancy Motion Sensor Detector Light Switch 100% brand new and high quality The use of infrared technology, automatic control, when people enter the switch sensing range, the sensor detects changes by the infrared, the switch automatically switches on. If people do not leave the sensor range, the switch will continue to switch on; When people leave, switch is automatically shut off the lights, it is safe, convenient, more energy efficient. Easy to install or replace existing switch. Applies to places such as corridors, corridor, bathroom, basement, warehouse, garage, automatic lighting, automatic ventilation of the exhaust fan and other electrical automatic control and other functions, can be used for security and other purposes. Quantity:1pc