**Function as indicator, signal light, door light, side light: T10 Series products *** Function as tail light, brake light and turn light: 194 168 501 W5W 147 152 158 159 161 184 192 193 259 280 285 447 464 555 558 585 655 656 657 1250 1251 1252 2450 2652 2921 2825 **** Built-in current limiting resistor and diode to protect the LED from reversed polarity + - installation.(If they dont light after inserting into the socket, please insert oppositely or flip the bulb horizontally to match the + and - polarity)