Use with indoor or outdoor devices requiring a grounded connection. Photocell activated- Activates programming and resets only after the 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 the unit. Patented "Reverse" Grounded-pin placement- When mounted to the 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.