APPLICATION Switchback dual function only works when your original bulbs have both parking/DRL and turn signal lights in one bulb. Dual color switchback function: Light up white for parking lights or daytime running lights (DRL lights); Light up amber for turn signal lights. The turn signal flashes "amber-off-amber-off, " instead of "amber-white-amber-white", which makes it easier to see. Non-polarity installation, both US standard and CK Socket. MAIN FEATURES SUPER-BRIGHT LIGHTING 16ps pieces of customized 3030LED, 5.5W per bulb, only 1/4 energy consumption of original halogen bulb but 3 times brighter. 300% brighter than halogen bulbs. CANBUS READY Built-in constant current IC, instant light on without delay or flash. LONGER LIFESPAN 6063 Aluminum Made in the highest quality. Complete aluminum body designed for quicker heat dissipation. Extends lifespan to 30,000 hrs. PACKAGE INCLUDED 3157 LED Light Bulbs *2 SPECIFICATIONS Plug Type: T25 3157 3156 UniversalLED Type: SMD 3030Efficacy(per bulb): 5.5W/White, 5.5W/AmberLED Quantity(per bulb): 16pcsEfficacy Lumen(2/pcs): 300% High BrightnessOperating Voltage: 12-24V, fit 12V carColor: 6500K Cool White, 3000K AmberAdjustable Color: YesMaterial: Aviation 6063 AluminumLED Lifetime: 30000 hoursWaterproof: IP67 WARRANTY 1-Year hassle-free warranty ATTENTION The bulb size may vary between trims of your vehicle, please double-check the owner's manual or original bulb number to confirm before purchasing. FIT SIZE: T25, 3156, 3157, 3056, 4156, 3047, 3157A, 3057, 3357, 3457, 4057, 4114, 4157, 3757, 3457NAK, 3157AK, 4157NAK, 3157LL, 5702A, 5702AK, 5702AK, p27/7w, 3155, 3047KX, 3157KX, etc.