I bought three of these toothbrushes for my daughters for Christmas. One of them didn't work from the start and it appeared the batteries didn't connect although they were in correct. The second one only works intermittently and it goes off and on as my daughter brushes her teeth. The third one stays on but mostly vibrates in the handle and not the toothbrush head. I would have been better off purchasing battery operated toothbrushes from the grocery store at half the price and they come with batteries. The only good thing about these toothbrushes are they come with two toothbrush heads and they have a cover for the toothbrush head.