Includes 1 AA battery. Great clean made fun! Clean your teeth better than with a manual brush and make brush and make brushing fun! Enjoy all the different designs! 1. Small vibrating head with extra soft. Bristles: Cleans teeth by gently sweeping away plaque. 2. Easy on/off buttons. 3. Slim handle. 4. 1 replaceable AA alkaline battery. Do not install backwards. Do not charge battery or put in fire. May explode or leak causing injury. Brush lays flats for easy toothpaste application.