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 did not return it because i already took it on a trip untried but i will not be using it again