Safe Material: BPA free drinking water dispenser, 304 stainless steel, high density ABS plastic, no toxic, and no smell. High Compatibility: The electric pumping device suitable for pure bottled drinking water, suitable for a variety of models gallon barrel without pry the lid. USB Rechargeable Battery: Built in rechargeable 1200mAh battery. Can used for 30-40 days or around 4-6 bottles of 5 gallon water once full charged. No need to charge every day. Easy to Use: Simply fasten the small pump on the bottle mouth. One switch operation, totally hassle free even for kids and elders. Note: This drinking water pump is suitable for gallon barrels with a 2.16-inch (5.5cm) neck. Operating Voltage: DC 3.7V Power Rating: 3.8W Charging Time: 3-4 Hours Charging: Micro-USB Charging Cable Suitable for: 2,3,4,5 Gallon Water Bottles Size: 2.95.1 inch/7.513cm Hose Length: 21.7inch Pipe Length: 4.7inch Instructions: Connect the silicone hose and insert the silicone hose to the bottle. Then fasten the