Before you buy, please check your turn signal is buit In mirror cover or Under mirror cover.
and choose correct option in order.
KIBOWEAR Dynamic Scroll Mirror Indicator LED Turn Signal for Au-di B8.5 only.
Dynamic turn signals are just starting to appear on new cars, such as the B9 Au-di A4. Instead of the entire turn signal lighting up all at once, KIBOWEAR dynamic turn signals light up progressively towards the outside of the vehicle. KIBOWEAR for your A4 A5 changes your mirror turn signal into a sequential light pattern for an excellent eye catching look.
Due to KIBOWEAR dynamic flashing, the change of direction is visually indicated. During the flashing process, the inserted LED lights "wipe" one after the other from the inside to the outside in the desired direction. When this process is completed, the process restarts and repeats. 
Advantages:
Dynamic turn signal,easier to be seen by other drivers when you are turning right/left.
Semi-Smoked lens,looks luxurious as sport style.
LED technology,more durable.
Plug and play installation,100% ERROR FREE.
Easy to install, directly connected to the original plug.
No coding required.
With matte surface for scratch resistant.
Fitment:
A4 B8.5 (2011---2016)  ,
A5 B8.5 (2010----2016) 
S5 2010-2016
 A3  8P  (2008-2013)
RS3 2012 only
RS4 2013 2014
RS5 2011-2016
Before you buy, please check your original side mirror covers carefully.
B8 model and B8.5 model are using different side mirror covers.
If your side mirror is B8 type, please buy at below link:
https://www.aliexpress.com/item/KIBOWEAR-Dynamic-Blinker-Mirror-Light-for-Audi-A6-C6-4F-A4-A5-B8-8K-Q3-SQ3/32952295921.html 
Please know that our turn signal has normal seam, 100% waterproof, not crack.
If you mind the seam, please do not buy(The VW factory turn signal has similar seam too).