Review (1/5): DO NOT BUY THIS TOOTHBRUSH
I bought this toothbrush to replace one which I used for FIVE YEARS. The reason it was replace was due to the o-ring in the cap wearing out, and failing to seal. Fine for five years worth of use.
The new one I bought lasted approximately 2 weeks before the batteries died, and I popped it open. The batteries had leaked acid all over the compartment. Not sure if water had gotten in or the batteries were bad, but it is ruined. Before you judge me for misuse, see how I had the previous one for FIVE YEARS with no problems. I don't shower with this thing. I don't even submerse it.
Total junk, and if I wasn't deployed with the military, I'd send it back.