For old classic cars using 1158 negative chassis ground 6 volts, 2 filament or brightness 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. The difference between a 1157 and 1158. The 1157 the bayonets are offset while the 1158 are the same. Long life up to 30,000 hours.