1. SAFE: This BPA- drinking water dispenser is made of materials that are and non-toxic. The high-grade 304 stainless steel, food-grade silicone hose, and high-density ABS plastic used are designed to provide a long-lasting, product without any unpleasant odors. 2. EASY: : 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. 3. RELIABLE: 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. 4. High Compatibility: Suitable for 2.16-inch (5.5cm) neck's 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.