IDAODAN Electric Air Balloon Pump, Portable Dual Nozzle Electric Balloon Inflator/Blower for Party Decoration - 110V 600W (Purple) pinch two sides of mouth of balloon with your fingers cover inflation port with balloon inflate balloon by pushing inflation port down release inflation port when balloon size is suitable Please be aware that this product will only fill the balloons with air, not helium or hydrogen. This machine only for round balloons, do not inflate long balloons.