With automatic lighting detection circuit, and it will shut down during the day and open during the night automatically. Makes your lighting is only used when it should be. Helps to increase energy efficiency and bulb life by reducing daily operating life. Perfect for wiring into a lamp or lighting systems requiring photoelectric automation. Can work with most types of light lamps, such as LED, incandescent, and fluorescent bulb. Suitable for installing places where needs lighting at night or low light environments. Can be used with garden light, yard light, entry lights, walkway lighting, barn lights.