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Tapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of one Book of Everything. This icon is only shown if you have at least one Book of Building. Tapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of one Book of Building. Tapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of the displayed number of Gems.
![coc 3d base th7 coc 3d base th7](http://www.estrategiascoc.com/base/_data/i/upload/2019/07/15/20190715145021-3c66ef1d-cu_e260x180.jpg)
When the Firecrackers is at maximum level, or the Builder Hall requirements for the next level are not met, this icon is not shown. Tapping this icon instantly upgrades the Firecrackers to the next level, at the cost of one Hammer of Building if you have one. When the Firecrackers is at maximum level, this icon is not shown.
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Tapping this icon begins upgrading the Firecrackers to the next level, if you have enough resources and a free Master Builder or O.T.T.O. Tapping this icon displays information about the Firecrackers, such as Level, Damage Per Second, Hitpoints, Range, Damage Type and Targets.
![coc 3d base th7 coc 3d base th7](https://i.ytimg.com/vi/-t4kckLsNnQ/maxresdefault.jpg)