Interior LED replacement bulb used in bi-pin halogen fixtures. Lasts 30 times longer than the G4 it replaces (60,000 hour life expectancy). Energy efficient - can run 7 'Revolution Bulbs' for same power draw as one incandescent. Draws 113 milliamps. 35% brighter than the incandescent. Patent pending state of the art copper heat dissipation apparatus helps the unit stay cool. FCC approved - will not interfere with radio/analog signals.