NOTE: AC/DC voltage 12V-24V: the bulb can be used directly AC voltage 100-240V: need to connect a compatible transformer Small size Ø35*35mm, please check the compatibility in advance, thank you very much! Transformer Usage: Electronic Transformer: The connected bulbs must reach the minimum output power of the transformer, otherwise the bulb will flicker. The flicker problem can be solved by installing a capacitor (in parallel with the circuit). LED transformer: no problem 85% Energy saving GU4 MR11 12V 2W is an ideal substitute for GU4 10-20W halogen lamp, saving power consumption more than 85%. The average life is 30,000 hours. LED lighting is energy efficient and efficient! 35mm MR11 GU4 LED 12V MR11 recessed LED spotlight with GU4 base, small size Ø35*35mm, easy to install. Before buying, check that it is compatible with your lighting equipment. Ideal for kitchen furniture, bathroom, showcase, dining room, caravan, etc. Cool White 6000K - 120° MR11 GU4 12V 2W cold white 6000K LED