Press the handle to turn on the indicator light and the machine is activated, and the indicator light will disappear and complete the seal. Release the handle and no power supply This is the principle of operation of an impulse sealer and allows continuous sealing.The control panel of the sealer is mechanical, so you cannot see the temperature values and working time. Different sealing bags require different gears, and the first time you use them you need to test the best gear and push force repeatedly.About Seal Material: This product can seal plastic bags with PE film, Kraft paper bags with PE inner film, aluminum foil bags.