· Level 3 is enough for most applications; thicker the bag, higher the level required · The red light is not predictable when plug into the power. It is only predictable when keep the handle pressed down on bottom. This is a protection for sealer · When seal is done, the red light will go off. Don't release the handle at once and keep the handle pressed down for a few seconds to get optimal results. If you use a 12-inch sealer, please put your hand on the middle of the handle would be better · Replacements should be replaced when the PTFE (cloth) appears warn, discolored or sealing isn't perfect · Never wipe the heat seal strip with a wet cloth . This sealer machine can't cut any bags,it's just better for sealing PP,PE material bags! Step 1 Plug into the power Step 2 According to the thickness of bags, adjust the sealing timer to 1-8; and level 3 or 4 is enough for most bags; Thicker the bag, higher the level required Step 3 No warm-up time needed, Just put the bag on the machine flat Step 4 Press dawn the sealing machine’s arm. When the signal light is off automatically, keeping the handle pressed down for a few seconds would get optimal results Guide for Replace the Sealing Machine 1.Using the tools to loosen the screws on the sealing machine 2.Remove the old heat sealing strip and heating element 3.Install a new heat sealing element 4.Then tighten the screws