Safe and Healthy Material: This water dispenser is a BPA-free product, which is made of food-grade silicone hose, 304 stainless steel hose, non-toxic and tasteless high-density ABS plastic. Providing you with healthy water. Protable Design: Perfect for the office, home, school or outdoors. Fits gallon barrels of different capacities with a 2.16 inch (5.5 cm) neck. Please confirm your barrel neck size before purchasing. Long time working time: This USB rechargeable water pump is built in the 1200mAh rechargeable battery, which can be used 30-40 days or pump about 4-6 5 gallon bottles of water when fully charged about 3 hours. Easy to use: Just open a small hole in the mouth of the bottle where you can put the hose and engage the water pump to the bottle. One-button automatic switch operation, press the button to turn on or off.