Air output: 200ML Material:Silicone. Terminal instant kia attenuation:No effect. Extruded air is not sucked in when the airbag rebounds:Yes Individual one-handed operation:Yes Everyone can relate to the discomfort of ear pressure. You might experience this while flying on an airplane or traveling on a fast moving elevator (especially when you have a cold or allergies). The pressure on the eardrums and the related discomfort can be unbearable. Not to mention the reduction in hearing from the pressure on the eardrums and the potential for more serious problems if the pressure isn't relieved. The EarPopper device is currently being used in practitioners' offices around the world for ear pressure relief and treating the problem at the source - The Eustachian Tube. The Eustachian Tube (ET) is the body's only mechanism for equalizing pressure and ventilating the space behind the eardrum (Middle Ear). The ET normally opens when you swallow or yawn. When functioning normally the ET keeps the middle ear ventilated and the pressure equalized. Prohibition of total attention: 1, suspected nasopharyngeal secretion should not be blown to avoid blowing the secretion into the middle ear caused by the disease.