Using the Advanced Pro AVLP4 Vacuum Lifter is easy. First, make sure the lifter is clean and in good condition. Place the lifter on the heavy material you want to lift, like a stone slab. The vacuum will start working, and when it reaches the maximum level, the energy - saving device will turn off the air supply. When you're done, wait for the vacuum level to fall, and the air supply will turn on again to release the suction. Important things to note: Don't use it on wet or dirty surfaces as it may affect the vacuum suction. Avoid overloading the lifter beyond its recommended capacity. For maintenance, regularly check the extruded aluminum handles for any signs of damage. Clean the vacuum area to keep it working efficiently. If you notice any problems with the energy - saving device or the suction, stop using it and get it checked by a professional.