Energy Saving: Save up to 90% on your electricity bill with LED lighting. Replace 35-40W halogen bulbs with 3W LEDs. Now with LED for a more true and natural color experience. Long life: 12V AC/DC more stable than standard DC 12V LED bulbs, working range with 30,000 hours lifespan, 25 times longer life than incandescent bulbs. High power 24 SMD 5730 LED chip: low power consumption Power measured at 3W outputting 400 lumens, the quality of 5730 chip is better and more stable than 5050, 3528, 2835 chip. Suggestion: These MR11/GU4 LED bulbs can only be used for 12V (AC 12V and DC12V). Please note that these LED bulbs are not dimmable, please never use them with a dimmer switch or an unstable 12V system, otherwise they will flicker or make noise and then quickly break. We always suggest you use LED power supply or LED transformer to connect LED bulbs. (Never use halogen transformer, electronic power supply, halogen power supply). High quality lighting: no flickering, no humming and no radio or TV interference.