To install:
The installation was easy wiklich. In being carried out at the device only everything must press together. More complicated was the right places to find the car. Where this is not a problem of the module. The installation with function test takes approximately 1-1.5 hours.
To function:
As I had read in another review, the system reacts a little slow (compared to an original system) and I must say that, you go, too slowly backwards.
Therefore, I do not mind the delay.
Graduation:
On the whole, I am very satisfied with the system. And especially for the price you can not say anything.