This is a convenient light sensor timer that automatically turns on and off electrical appliances, such as lighting fixtures, connected to a power outlet, according to the outdoor brightness. It's useful for illuminations and sign lighting. Three convenient operation modes: * Always-on mode * Light sensor mode: Turns ON when it gets dark, and OFF when it gets bright * Light sensor + timer mode: When used with a timer set to 2, 4, 6, or 8 hours, it turns ON when it gets dark and automatically turns OFF when the specified time has passed. Purchased about 5 years ago. Used for one season during the winter. Operation confirmed. Lights up when it gets dark. I tested it with the 2-hour and 8-hour settings. It turned off correctly after 2 hours and 8 hours.