Specifications: Bulb size: 9005/HB3 9006/HB4 led fog lights Good for fog light： DRL Features:Come with Apple and Android QR code Sync to music function, changing colors with music rhythm Steady function: thousands of color available on the color selection wheel Dimming function: adjust light brightness instantly Long life span: up to 30,000 hours Installation: 1.Install one of the bulb in your car; 2.Connect the small point; 3.Install the other bulb to your car, and connect the small point; 4.Connect the original socket to your car, then turn on the power, don't mind the other socket as it's the decoder socket. 5.Scan the Apple or Android QR code, download the APP and open it, allow Bluetooth access, then choose the color you like. Note : please wait 2~3 minutes for APP to work. Package include: 2 X multi-color LED fog bulbs ; 1 X Instruction card; Note: 1. Please double check your vehicles owner's manual or the original bulb to confirm the correct light size you need before placing the order to avoid return hassle. 2.A few car (Benz, BMW, Volkswagen) may require decoder to solve the error codes/flicker issue. 3. If you have any questions when purchasing, please click on our store name "HNNUY" at the right top and contact us firstly. We'd like to solve your problems asap.