This Review Title is Good cleaning performance but bad battery cover design and the content is: It does a good cleaning however the battery cover design is bad. It's snap-in type, not screw-in type, therefore water gets in so easy. After 8 months of usage, there is sign of water damage. Note that I did clean the device every 2-3 weeks. The battery cover also got corrosion that it can not be fully snapped in..There are other information for this review, one is This reviewer did not purchase it and the other is 1 people think this review is helpful.