1. Model: E10, Voltage: 12V; LED Color: 6000K Cool White, Lumen: 150lm. Current: about 0.05A, tested at 12V DC 2. Polarity: Negative ground (positive "+" on the tip of the bulb), not suitable for positive ground system. 3. Function: flashlight, headlight, other lanterns, etc. Size: 31 x 11mm (L x D). 4. Easy Installation: Replace the bulb by unscrewing the flashlight head from the body, removing the retaining collar and old bulb, then inserting the new LED bulb.