Boosters are items that increase reputation, experience and silver income by a cernatin value for several matches after have been being activated.
The bonus You gain from using boosters is shown in every after-match screen, and by howering your mouse cursor over a booster you can see how long it will last.
To purchase the booster, hower over it and press "Buy more". You can also extend the duration of available boosters or check the automatic purchase and activation box.
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