Don’t Run Out Of Juice Trendy, multipurpose mugs can seemingly do everything nowadays- except tell an annoying coworker you haven’t had your first cup yet. Set the record straight with the Battery Magic Mug, featuring amazing heat-changing technology that lights the battery icon up with fully charged bars when you pour a hot cuppa! The bars also disappear one by one as you empty the mug, so you don’t have to say a word before you’re done caffeinating. 320ml capacity Heat changing graphic Do not use in microwave or dishwasher