It is a perfect security microwave sensor 2 in1 light and switch all together, suitable for step, passageway Bedroom, Aisle, Hall, Lobby ,hotel etc., Using passive microwave sensor technology to sense human motion (within 5m) will automatically turns on when human motion is been detected within the range and automatically goes off when motion is no more detected within the range after the delay time of 30s, is active both day and night