Used to replace 3157, 3156, 3357, 3356, 3457, 3456, 3057, 3056, 3155, and 4157 incandescent automotive bulbs in Brake, Tail and Turn Signal applications behind red lenses. Features 12 super-bright Red LEDs that are rated for 100,000 hours, feature non-polarized circuitry that enables them to work either way they are plugged in, in all applications, ultra tough poly-carbonate housings with cooling holes, oversized resistors and diodes and metal-plated circuit cards, all of which pull heat from the LEDs to provide long, stable life. Vibration resistant. Energy-efficient low current consumption.