NOTE: AC/DC 12V-24V voltage: the bulb can be used directly AC 100-240V voltage: must connect a compatible transformer Small size Ø35*35 mm, please check compatibility in advance, thank you very much! Transformer use: Electronic transformer: The connected bulbs must reach the transformer's minimum output power, otherwise the bulb will flicker. The flickering problem can be solved by installing a capacitor (in parallel with the circuit). LED transformer: no problems 85% Energy Saving GU4 MR11 12V 4W is an ideal replacement for GU4 35W halogen lamp, saving energy consumption by more than 85%. The average lifespan is 30,000 hours. LED lighting is energy-saving and efficient! 35mm MR11 GU4 LED Recessed LED Spotlight 12V MR11 with GU4 base, small size Ø35*35mm, easy to install. Before purchasing, please check that it is compatible with your lighting equipment. Ideal for kitchen furniture, bathrooms, display cabinets, dining rooms, caravans, etc. Warm White 3000K - 400LM MR11 GU4 LED Spotlight 12V 4W warm white 3000K, 24 SMD LEDs, 400 lumens with a beam angle of 120 degrees. No noise or flicker. CRI>80Ra, vivid and natural colors. This GU4 LED is not dimmable, not compatible with dimmers.