NOTE: It's better to use a LED transformer. If you want to connect a halogen transformer, please make sure that all the power of the LED bulbs must reach the lowest power of your transformers, otherwise they may flicker strongly and not work. RELIABLE QUALITY AND SERVICES: You can get a refund within 3 months and a replacement within 2 years. If you have any problem, please contact us by email and customer service will reply you within 12 hours. GU5.3/Mr16: 5W LED replaces 40W halogen, 450LM, Voltage: AC/DC 12V (AC12V or DC12V LED transformer required), non-dimmable, Dimensions: Ø1.97xL1.89in. High color rendering and 120 beam angle: this LED lamp MR16 has a color reproduction index of 80+, which makes the light look more vivid and close to its original color, thus relieving eye fatigue. SAFE AND DURABLE QUALITY - Eco-friendly GU5.3 LED bulbs and synthetic material. No lead or mercury, no UV or IR rays, non-flickering bulbs for minimal eye irritation. Safe for the environment and home