Operates 7 to 9 Volts positive ground or negative ground. Up to 135 Lumen output. Approximate size 0.7 inches long by .46 inches wide at the plastic ring while the base is .356" which is 9mm. 120 Degree viewing angle. Uses .079mA at 8.8 volts. Comparable to a 20 Watt incandescent. Long life up to 30,000 hours. Great for dashboard instruments. Available in White 6000K, Warm White 3000K, Red, Green, Blue and Yellow/Amber. The light is dim-able using a variable voltage supply such as your dashboard dimmer. This bulb uses 80% less energy than your incandescent bulb, great for old generators. CE and Rohs. Size is a T3 1/4.