2006 BMW 118d

I bought a new bmw car several months ago; recently it always happen strange voice. i am worried.

so I want to buy a diagnostic tool for my car. I heard from my friend that Lencoo Electronic Co.,Ltd which is the manufacturer of car electronics own a high reputation about this kind of product. I have no idea about it, i dare that it will not suit for my car.
so I hope you can give me some suggestion.

Buy or not? Here is the link for the products.

www.lencoo.com/super-autoboss-v30_p1514.html
Thanks very much

ps: my bwm car is manufactured in 2006