Alla Lighting 3157 Standard SRCK CK 4157NA Dual Color White Amber LED Switchback Extremely Super Bright High Power 2835 28-SMD LED Bulbs for Turn Signal Lights (Set of 2) Compatible with both standard & CK socket. LED Type: 28 pieces high power & high quality led chips per bulb. Dual Color: 6000K xenon white & amber yellow: Light white for parking lights or daytime running lights (DRL). Light up amber-off-amber-off for turn signal lights instead of amber all the time to make more noticeable Cross Reference: 3047,3047LL,3047K,3057A,3057ALL,3057,3057ST,3057K,3057KX,3057X,3057KLCP,3057LL,3155,3155LL,3157A,3157AK,3157,3157K,3157X,3157LL,3157ST,3157KX,3157NA,3157NALL,3157NAK,3357A,3357ALL,3357,3357LL,3357K,3454NA,3457A,3457ALL,3457AK,3457,3457K,3457NA,3457NAK,3757A,3757AK,3757ALL,4057,4057LL,4057K,4114,4114LL,4114K,4157,4157LL,4157K,4157NA,4157NAK,5702A,5702AK,5702AK,3157-SCK,3157-SRCK,3157-SACK, etc. Dimension (inches): 0.70 in diameter, 2.50 in length It requires 50W 6ohm load resistor & the led switchback only works greatly based on the original bulb has dual function: front turn signal & parking/ DRL on the same bulb. Warranty: 1 year hassle-free warranty. Working Voltage: 12V ~ 18V DC Energy-Saving, Low temperature, Low Power Consumption, Longer lifespan up to 50,000 Hours, best value in the market. Alla Lighting,Amazon branded registry, provides worldwide best customer service for our customers, We are one of