LE 2W Super Bright MR11 LED Bulbs, Not Dimmable, Equal to 30W Halogen Bulb, 12VAC/DC, Narrow Beam, Warm White, Pack of 4 Units Pack of 2 Units. Not Dimmable. working voltage is 12VAC/DC Save electricity bill. Replace 30W halogen bulb by 2W LED will save over 90% on electricity bill of lighting. Easy installation. Standard MR11 shape with GU4 base. Lifespan is over 50000 hrs. Save effort and maintenance costs on changing bulbs frequently.