Small water receptacle [SEP] I bought this for travel because I wanted something without a plug.  The water reservoir is so small you have to refill it at least twice to get your entire mouth irrigated.  It is also a leaky mess to use and I use a WaterPik multiple times a day so I am aware of how they work.  The size is quite bulky for travel for such a small resservoir.  I didn't return it because I already took it on a trip, untried, but I won't be using it again.