"Keep flying pests away with flurries of small rockets! It's like a bug zapper, but prettier."
Firecrackers are the Builder Base version of Air Defense. Like the Air Defense, they attack flying units; however, they are slightly less powerful while also being slightly smaller covering a 2x2 space.
Firecrackers can only target and shoot one air troop at a time. However, it attacks 3 times every time it fires.
They cannot harm ground-based units, or interfere with them in any way other than potentially distracting them from attacking a more valuable target (e.g. the Builder Hall).
Tapping this icon displays information about the Firecrackers, such as Level, Damage Per Second, Hitpoints, Range, Damage Type and Targets.
Tapping this icon begins upgrading the Firecrackers to the next level, if you have enough resources and a free Master Builder. When the Firecrackers is at maximum level, 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.
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.
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. This icon is only shown if you have at least one Book of Building.