Manual: Clean the rubber pad and the object to be vacuumed Place the rubber pad facing the object, press the suction cup onto the object and then press the blue plunger several times. When the red warning line inside, you can lift or move now. Characteristics: Provides reliable and temporary vacuum support without drilling holes. The rubber vacuum pad will not mark or damage most surfaces. Attaches to flat or curved, smooth and non-porous surfaces. The red line indicator warns the user of any loss of vacuum. The non-return valve allows pumping without loss of remaining vacuum. The lifting tabs on the edges of the vacuum pad allow instant release. Comes with vacuum cushion protector