• Important Notes For The Orange Valve: （1）. Before using the cups, ensure that the orange valve MUST BE in the "PULLED-OUT" position. Otherwise, the vacuum pump will be unable to extract air, causing the cup failing to adhere to the skin; （2）. When the cup is attached to the skin, make sure that the orange valve is in CLOSE with the black silicone seal inside the suction cup to prevent poor sealing and reduced suction.