B21 Series 3157 Switchback LED Bulbs Built in Resistor CANBUS Error Free Anti Hyper Flash T25 3057 3457 4157 Bulbs White and Amber 600% Super Bright Turn Signal Light DRL Parking Light. Unlike most turn signals flashing "amber-white-amber-white" on the market, the 3157 turn signals flash "amber-off-amber-off", making it easier to see from a distance.