Safe Material : Water Bottle Pump made from BPA-Free, food grade silicone hose. 304 stainless steel, high density ABS plastic, no toxic, and no smell. Key Product Features Convenience : The drinking water pump is suitable for gallon barrels with a 2.16-inch (5.5cm) neck. Don't need to pry the lid. So it fits most water bottles and for 2-5 gallon water bottle. USB Charging : Built in rechargeable 1200mAh battery. No need to charge every day, It can be used for 30-40 days of one charge. Can be used in Indoor or Outdoor. Easy to Use : Simply fasten the small pump on the bottle mouth. One switch operation, totally hassle free even for kids and elders. Press once switch, pump 0.16 gallons of water and stop. Widely Applications : Water bottle pumpis great for home or office use, and the compact size(5.4 x 3.8x 3.8 inches) makes it easy to carry and suitable for camping, picnics, kids sporting events, beach days and barbecues.