If your working voltages is 100-240V,a transformer for 12V is needed. We recommend to use led transformer or keep 1 or 2 halogen lamps to meet the Minimum power of tranditional transformer. Specifications: Base: MR11/GU4, Power: 2W Color temperature: 3000K (Warm White) Dimensions: Dia 1.38 inch x L1.38 inch / Dia35 mm x L35 mm Input voltage: DC 10-30V / AC12V Lumens: 200LM, CRI (Ra):> 80 Beam angle: 120 degrees Package Included: 4 x MR11 LED Bulb Any doubts and question, please kindly contact us. ★ SAVING MONEY: Lower Consumption and Higher Brightness, 2W LED replaces 20 watt Halogen Spotlight Bulb, save up to 90% on electricity bill. ★ EXCELLENT PERFORMANCE: Transparent glass cover is safety protection and dust proof damp proof. no flicker, no buzzing sound and eye-protective. ★ EASY TO INSTALL: Standard GU4.0 Base, Plug & Play, Warm White 3000K, bright and natural light, creating a warm and welcoming environment. ★ LONG LIFETIME: With a lifetime of up to 30000 hours, you can reduce the hassle of frequently replacing your light bulbs. lower heat, safer than Incandescent bulbs. ★ WIDE RANGE OF USE: For Landscape Lighting, range hood, Display Cases, Recessed Lighting, Hospitality Lighting, Residential Lighting, etc.