Great for its purpose
Purchased this solely based on the usb power but did not have to charge it on the trip because the charge held for a 14 day vacation without any issues. The brush is Not as strong as a normal electric toothbrush but worked nicely as a temporary toothbrush. I liked the electric queues for switching. If you place the setting on the pulsating option you will get the strongest vibration. The charge held a long time.
Rating: 4 stars