What is it?

It gives you 50 TC for every match you play instead of 10 TC, and can be found here.

thats a booster. and that means that it will boost your tc when you win a match, It will boost your earned Tc to a certain amount. (In your case 50tc)

There are many kinds of boosters 50tc booster 200tc 500tc Etc...

To buy a mobile booster you MUST have a mobile phone whit money in it.