Color changing mug with battery.
Magic mug with an empty battery printed on one side. Special ink covering this mug reacts to heat and changes appearance.
Pour some hot water or tea into this heat changing mug to see how the battery gets fully charged. After cooling down or pouring cold water mug returns to the original state.
It makes a fun gift for those who are always busy, always on the move, as well as those who need more energy in the morning.
Give it to your coffee-loving friend – let him feel the power accumulated in the Battery mug with coffee inside.
