THE ADVANTAGE: High quality switches specially designed for the home, lights turn on when people arrive and lights turn off when people leave, reducing energy waste. CAN IDENTIFY DAY AND NIGHT: the consumer can adjust the ambient working light. It can work day or night when set to the "sun" (max) position. It can work in ambient light below 10 LUX when set to "moon" (min) position. Regarding the setting model, please refer to the test model. DELAY TIME IS CONTINUOUSLY ADDED: When it receives the second induction signals after the first induction, it calculates at again the time based on the first delay time. DELAY TIME IS ADJUSTABLE: It can be adjusted according to the consumer's desire. The minimum time is 10sec3sec. The maximum is 7min2min.