Voltage:12V/24V Interface Type:T25 (3157) Model Name:28smd dual color Wattage:21W Item Type:Turn Signal Origin:Mainland China 3157 Standard SRCK CK Socket 4157NA Dual Color White Amber LED Switchback Extremely Super Bright High Power PX 28-SMD LED Bulbs Product Size: 3157 Switchback This listing features one pair (2 pieces) super extremely bright 3157/3457/4157NA LED switchback dual color amber white high power PX 28-SMD led bulbs especially designed for replacing the original bulb has dual function: front turn signal & parking or DRL (daytime running light) on the same bulb Specification 1) Package : including 2 pieces extremely bright 3157 Led swichback bulbs. 2) LED Chips : 28 pieces high power PX SMD per led bulb. 3) Cross Reference: 3157 3157A 3057 3155 3157NA 3357 3457 3457A 4057 4114 4157 4157NA etc 3) Cross Reference : Light up white for parking lights or daytime running lights. Light up amber-off-amber-off for turn signal lights instead of amber all the time to make more noticiable 5) Warranty : "One Year" guaranteed on manufacturer quality 6) Please note: Due to led bulbs draw much less current than stock lamp, your car may require load resistor to avoid hyper flash or malfunction.