Description: Cancel Error message cause by OBC (On-Board Computer) Check. Cancel Hyper Flashing on Turning Signal Reduce the Power on LED light so that can work better. Simply twist your LED bulb onto the base, and twist the other end into your existing bulb socket. Applicable to Most Auto Car Vehicle Automobile with 3157-A Socket. Compatible for 95% of vehicle with CANBUS System Including European vehicles such as Audi, BMW, Porsche, Volkswagen or domestic vehicles for fog lights or turn signal lights and ensure the LED bulbs light up full power without malfunction issue nor flickering issue Material: Plastic Size?15x5x3CM Specification: Application: 3157 LED Decoder Voltage: 12V Package Includes: 2 pieces 3157-A lED decoder adapter Note: This LED decoder is only suitable for non-switch back light, if you want to install your switch back light bulb, please select other load resistor to solve OBC error There are 2 different kind of 3157 adapters(A type and B type). Please double check the adapter to see if it will fit into your car or not. (You will get the exact decoder you see in the picture.) Please Read All Description and Fitment Before Ordering the Product