Please confirm your car's model Compatible with: (DO NOT buy if your model is not compatible or not listed below.) Reference Part No.： A2038201521 A2038201621 For Mercedes Benz C W203 (2000-2007.04) For Mercedes Benz C T-Modell (S 203) (2000-2007.04) For Mercedes Benz CL203 (2000-2007.04) These are not OEM products but perfect aftermarket replacements. - Package Includes: 2PCS Turn Signal Lights (Left + Right). Description of line connection For the blue light function, your first choice is to connect with the puddle light power if you have.Or you connect with the side mirror flip power. If you don't have all these two function, then you have to open the door panel to connect with the positive to get power, it is a little bit complicated. About dynamic blue effect,its when you lock or unlock the car,it firstly show yellow,then it slowly turn blue until full in the bar.This effect continues 10-15secs.When you turn left or right,it shows yellow,then it has 10secs blue Steering extended time for Safety. Note: 1. Please check as much as possible to make sure the item is the one that you need. 2.There Are No Instructions Included In This Kit. * Professional installation is highly recommended.! Please feel free to send email if there's any issue, solution will be offered once details confirmed.