Instruct: Classify Amazon reviews into positive or negative sentiment
Query: O-ring stopped sealing battery compartment

I bought this one at Walgreens because of the low price. The unit worked and cleaned well until I had to change the batteries a few months later. After that, the o-ring at the bottom didn't remain the water tight seal for the battery compartment. The whole unit eventually died. Phillips should offer a free o-ring, battery cap replacement kit.