Review (5/5): Useful for travel oversea, great customer service
Work as described. Bought mainly because of the USB port. With the proper power adapter, it can be used for international travel. The strength of water stream is not as strong as the Waterpik regular AC power product. The stabilizer in the water tank drains the water but make noticeable noise.
Re-edited: 10/14/2020
After around 10 months of usage, twice a day, the battery stopped charging. I contacted the seller to claim their one year warranty. In just three days, I have received a new replacement. Change to five stars for outstanding customer service.