Warm Tips: If the Product hums but doesn't pump, the motor shaft may have shifted slightly due to bumps during transportation. With the blue light on, place the unit on its side or slightly tilt it, and tap the side of the unit 2-3 times with your palm. You may hear a slight "click," indicating the motor has reset. The unit will immediately resume pumping Rechargeable: Can use for around 4 ~ 6 bottles 5 gallon after a full charged. Only need to charge 1-2 times a month. Note: Do not use a fast charger, a 5V 2A is suggested. If unable to charge, try a new cable/charger or use power bank