Small portable sealing machine suitable for preservation food storage such as snacks, chips, cereal bag to keep the food fresh which in turn reduce food waste. It is battery operated and you press it for about 3-5 seconds to start heating then put the bag to be sealed in the middle and slowly pull it at a constant speed to the end. If the battery is reversed the sealer will not heat up and also when the battery power is insufficient the sealing effect will be affected. It's always advisable to replace the batteries whenever necessary