For old classic cars using 1158 positive chassis 6 volts, 2 contrast levels. Operates from 6 to 24 volts AC or DC. 360 degree illumination. This is a BA15D base product. CE and Rohs listed, long life up to 30, 000 hours. Latest technology 5730 SMD LED chips for very bright and long life. The bulb fits the outline of a normal incandescent bulb. UP to 270 lumen output, it is a 1158 for older positive chassis 6 volt cars or motorcycles usually produced before WWII period.