Safe material: BPA free drinking water dispenser, Food Grade Silicone Hose, 304 stainless steel, high density ABS plastic, non-toxic. High compatibility: the pumping device suitable for pure bottled drinking water, suitable for a variety of Gallon Barrel models without forcing the cap. USB rechargeable battery: built-in rechargeable 1200mAh battery. Can be used for 30 - 40 days or around 4 - 6 bottles of 5 gallons of water once fully charged. You don't need to charge every day. Easy to use: simply attach the small pump to the bottle mouth. Note: this drinking water pump is suitable for barrels with a 2.16-inch (5.5cm) neck. Please confirm the size of your neck before purchasing. Note: do not use while charging; Do not use fast charging as it may damage the device. Measurements: Width: 50cm, Height: 28cm, Length: 50cm