VEVOR GPS-1 Mode D'emploi page 4

Operation Direction：
1.The principle of operation is by lever and pump action. The round suction
cups are pressed onto the surface of the object to be lifted. The lever grips
are squeezed together into position. The rubber pads are then securely
clamped to the surface by vacuum so that the object can be lifted. To
release, just flip back the levers.
2. The loaded surface needs to be smooth, relatively flat, and non-porous.
Surfaces should be free of oil, grease, or water; otherwise, slipping can
occur. Non-porous materials such as glass, metal, plastics, and polished
stone are good examples.
OPERATION AS BELOW
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1. Open the vacuum suction
plastic box and check if the
product and accessories are
intact.