Address Light, Security Light, and Porch Light: Replace Existing Porch Light With Very Bright Address-O-Lite: Photo Cell Turns Address-O-Lite On And Off Automatically: See Your Address Up To 175 Feet Away: Perfect Aid For Emergency Responders: Mounts Vertically Or Horizontally: Uses Energy Efficient Flourscent Bulb: Purchased Directly From Manufacturer: Complete With Numbers And Bulb, Nothing Else to Buy: Thousands Already in Use: Made In The USA See your address up to 175' away at night Combines security porch light and address light Easily replaces existing porch light Uses photocell technology and energy efficient flourscent bulb Comes complete with 13 watt flourscent bulb, 3" numbers, and instructions