Water Flow: 1 gal/min (4 L /min), Upgraded Version: Come with TWO detachable USB rechargeable batteries separated from the pump. External on/off switch feature, which is an improvement over previousdesign.Noneed to immerse the batteries into water,which can protect and enhance the batteries life. Durable and Powerful: We provide two batteries, one can work for up to 45-60 minutes with a full charge ,two for up to 90-120 minutes, which can make sure you will have a constant happy shower.The water flow is up to 1 gal/min (4 L /min),offers ideal and powerful water pressure to help make bathing easier. Easy Assembly and Operation: Just fully submerse the pump in your bucket/tub of water and turn the motor on,it will pumps water from bucket into steady, gentle shower stream and you get a nice flowing shower. Compact & Portable: Easy to carry and store in luggage,backpack or car trunk,perfect for outdoors,camping,hiking,kid bathing,pet cleaning,car washing, plants watering, windows and backyard cleaning or wash the sand on the beach Notes: PRODUCT OPERATE ONLY WITH WATER WITHIN THE TEMPERATURE RANGE 10C to 50C50 to 122,When you are assembling the product, be sure to put the white O-ring into the water connection or the shower will leak