Safe Materials: This BPA-free drinking water dispenser is made of food-grade silicone hose,304 stainless steel, and high-density ABS plastic, which are non-toxic, no smell. Easy to Use: This water pump dispenser is compact and intuitive, people can assemble this gadget easily, even without reading the user manual. You only need to press the switch button and fill your glass or bottle, press again to stop. USB Rechargeable Battery: This automatic water pump is built with a rechargeable 1200mAh lithium battery, which can last for 30-40 days, or work on 4-6 barrels of 5-gallon water. It can functions well in the places without electricity when you are in camping or picnic. High Compatibility: Suitable for 2.16-inch (5.5cm) necks gallon barrel without prying the lid. Fits 3, 4, 5 water bottle gallons/jugs. Not for threaded/screw tops. Please confirm your barrel neck before purchasing. What You Get: 1x Electric Drinking Water Pump; 1x USB Charger Cable.