The E14 to E12 converter is made of high-quality heat shrink tube and copper, it comes in a solid construction, insulation, anti-flaming, erosion resistant and sealing. The E14 to E12 Base adapter can be applied with multiple voltages, 12V, 110V-120V, and 220V-240V. It is compatible with LED, halogen, filament and CFL light bulbs. It is a really good helper for home lighting!