How to Use1.No power switch is required (auto-control), link the AC power cord with the socket, adjust the heating time just according to the thickness of the sealing-in material; put the plastic bag on the sealing-in surface and press the handle, and the circuit will automatically control heating time. The power will automatically shut down when the indicator light goes out. After 1-2 seconds, release the handle to finish sealing.2. Any damage that occurs during sealing is because of over-long heating time, please spin the rotary knob anticlockwise to shorten heating time.3. Too-short heating time will cause unstable sealing. Please spin the rotary knob clockwise to lengthen the heating time4. If the plastic bag sticks to the rubber pressing board, it means the cooling time is insufficient. You must lengthen the cooling time after indicator light extinguishment. Slightly late to release the handle5. Remain the heating time unchanged after adjustment, and no need to adjust it during continuous service.6. Keep the AC power cord always inserted on the socket, no electricity consumption when there is no sealing. Troubleshooting the following listed cases is excluded from quality issue 1. Repeated usage of heater strip breaks due to autoxidation, which leads to electricity failure, suggest replacing a new one (oxidation under high-temperature is a normal phenomenon) 2. Inner coil burnout or damage caused by overload continuous usage or wrong operation 3. Any man-made damage leads to non-operation cases.