Review (5/5): Good design
It is not clear from the ad, but the water tank expands from the bottom. I think this is to make it smaller for travel. It comes with a travel pouch. There are two main water picks one with a blue band and one with a black band, I gave one to my husband and I use the other. There are two other styles of picks but I have not tried them one looks like a fan. I have had this about a week and have refilled the tank twice and have not had to charge it which is nice. I like that the power button and the mode button are separate. This is a well thought out efficient water pick. I bought this based on the promise of a long battery life so we will see how that goes. The water tank is easy to fill. The instructions for pulling out the water tanks (until it says OK) and pressing and holding the on/off button for 3 seconds are very clear and user friendly