Simply press the top button. Easily switch ON/OFF to control aeration. Food-Grade material. How To Use: 1.Tightly install the tube on the diversion mouth at bottom of dispenser. 2.Put the tube into the bottle, press the dispenser downwards to tightly insert into the bottleneck. 3.Select to turn ON or OFF THE aerator switching valve according to aeration demands. 4.Place the wine glass below the dispenser spout, then press the button to dispense.