Electric Water Bottle Pump Automatic Wireless Gallon Drinking Water Pump Water Dispenser USB Rechargeable Water Pump Water Dispenser Instructions: Connect the silicone hose and insert the silicone hose to the bottle. Then fasten the water pump Press the button to pump out the water Press the button again to stop pumping Charge with the Micro-USB cable when out of battery colour: Black + white Safe Material: BPA free drinking water dispenser, 304 stainless steel, high density ABS plastic, no toxic, and no smell. Operating Voltage: DC 3.7V Power Rating: 3.8W Charging Time: 3-4 Hours Charging: Micro-USB Charging Cable Note: This drinking water pump is suitable for gallon barrels with a 2.16-inch (5.5cm) neck.