The 12 built-in clear LEDs turn brilliant red when illuminated
Replace your standard #1157 (or European P21/SW) bulb! As a taillight, LEDs light up in sequence to simulate rotation ("rotation" reverses every 2 seconds). As a brake light, LEDs flash simultaneously over 2 times per second when you press the brake pedal. Works with any 2-bulb system and is a must with clear taillight lenses. Low current draw ensures extra-long bulb life. Note: Not designed to replace turn-signal bulb. For off-road and show use only.