I purchased this at Costco about two years ago as a spare, but I never used it, so I'm putting it up for sale. Since it's unused and unopened, I'm not sure if the built-in battery works. It has been stored at home, so there are wrinkles and waviness on the back of the packaging. I would appreciate it if I could do business with someone who understands that it has been stored by a private individual. - Set includes: Electric toothbrush body, 8 replacement brush heads, charger - Target age: 3 years old and up - Features: Fun design for brushing teeth - Brand name: Kodomo Hapica - How to use: Easy to operate - Color: Blue ☆ Includes AA battery #KidsElectricToothbrush #ChildrensElectricToothbrush #Toothbrush #ElectricToothbrush