Dusk to Dawn is a low profile, LED area lighting fixture, designed for long life and low maintenance. The fixtures are designed to quickly and easily upgrade existing area lighting fixtures. Twist lock photocell receptacle and 120-277V photocell included with the fixture. User Manual - Dusk to Dawn 40W Twist-lock Photocell and Shorting Cap - spec sheet SP12714 –120-277V Surge Protector