its a simple plug& play device just like any other obd2. It has got no buttons unlike the other version icar2. Fuctionality is same for both as per the description. Bought it for around $13 and checked it on my polo tdi and my friend's polo TDI too..both the cars couldn't read it..but surprisingly both the cars could read the cheaper version blue color obd2. Later when I checked it on santro xing , it worked. and then I checked on i20 diesel,it didnt work. I have decided to try icar2 as well but the seller on aliexpress confirmed me that it doesn't work for diesel. So, in my opinion these so called faster ARM chip equipped icar2&icar3 doesn't work for diesels if not for majoriy of diesels. those cheaper ones only best for majority of cars I guess but as per people's opinion, they won't last longer.