Use with indoor or outdoor devices requiring a grounded connection. Photo cell activated- Activates programming and resets only after programming cycle has completed. Push-button select- Choose from 6 modes : 2hr 4hr 6hr 8hr repeat dusk to dawn. Countdown Timing- Starts at dusk for the timed duration selected Interruption- Free programming – headlight porch lights and street lamps will not interfere with unit. Patented Reverse Grounded-pin placement- When mounted to wall unit accepts most right-angle and transformer plugs 2 Outlets enable control 2 devices from 1 timer Mounting holes – safely secure unit to a wall. This 2-outlet outdoor rated countdown timer makes programming simple. The built-in photosensor activates the countdown and temporary light sources like porch lights or car headlights won’t turn off the connected lights or cause the program to re-set.