This fantatsic Eddison Style lamp works off 9 volts and comes complete with a RGB (multi colour) LED and a green flashing LED. To change the colour simply unscrew and replace the LED with your desired colour. Comes with a 9 volt battery lead. The lamp measures approx 50mm in diameter and approx 78mm in length including the screw base. A sure way to make your Steampunk build stand out in the crowd.