Eyenimal Pet Fountain Use the flow control button located on the pump according to + or - to adjust water flow at your convenience. This adjustment avoids undesired overflowing. This adjustment also reduces the sound level of the Pet Fountain. Contains up to 52.8 flu oz Comes with an AC Adaptor for power supply Easy to use Need Assistance? E-mail Ideal Pet Products, EYENIMAL's expert US-based customer care specialists seven days a week!