Listing is for 1 Red *MEGA BRIGHT* 12V LED. Use these in your Instrument Panel, Side Marker, Cargo Light and High Mount Brake Lights. This light has 66 mega bright LEDs mounted on it and will light over four times as bright as OEM bulbs. Note: These may not fit all applications; please note dimensions are 43.5mm Long X 12.5mm Diameter or 1.71" Long X 0.49" Diameter. Please make sure these fit your application before purchasing. We have tested many LEDs and we have taken the guess work out for you; these are the brightest LEDs available on the market! No dim LEDs here. You will not be disappointed. These LEDs are dimable, but depends on how low your dimmer switch voltage will go. White LED's generally look good installed behind your gauges for better illumination, while colored LED's generally look good behind the corresponding indicator lenses on your instrument panel and produce a much more vivid color. (Ex: Amber behind seat belt/check engine lenses, red behind oil/generator lenses and green behind turn signal lenses.) This LED uses the 194 wedge base. Please make sure this is your style bulb before purchasing. Compatible with: 194 168 501 W5W 147 152 158 159 161 184 192 193 259 280 285 447 464 555 558 585 655 656 657 912 1250 1251 1252 2450 2652 2921 2825 We also have WHITE LEDs see our eCRATER Store for those listings. Wedge type LED's are polarized, if they don't light simply turn them around to reverse polarity (+ -). WE SHIP WORLDWIDE!!!