MR-16 base 21-LED bulb. 12V. Bi-pin GX5.3 base. Long lasting, up to 30,000 hours. LED bulbs are 90% more efficient than incandescent and halogen bulbs. Mercury free, environmentally friendly. No UV emissions. Resists shock and vibration. Cool running and silent. Instant on. No warm-up time. Rapid cycling capacity. Lifetime not shortened by frequent on/off switching. Low maintenance costs. Accent lighting suitable for short-distance illumination. For highlighting artwork. No color fading.