This hard-wire photocontrol is ideal for putting outdoor post lamps, driveway lights or security lamps on an "on at dusk, off at dawn" schedule automatically. The unit fits into any standard outlet box, post lamp or wall pack. Once installed, this photocell outlet will help contain energy costs since your lights will only remain on when it is dark. The Woods brand of timers and home controls bring simplicity to your life, by maximizing convenience, security and energy savings.