TEQOYA air ionizers are extremely discreet and do work in absolute silence, without odor, without drafts. This mode of operation, particularly comfortable everyday, may seem surprising at first glance. There are at least 3 ways to verify that your Teqoya air purifier works normally: 1- Approach your hand of ion optics, it is possible to feel a light draft of fresh air: it is the "ionic wind", the current of air driven by the flow of ions! 2- Slowly approach your finger 1 or 2 mm from the needle housed at the bottom of an ion optics. You will hear a slight sizzle. If you do this operation in the dark, it is also possible to observe a slight glow at the tip of the needle. 3- Bring your ear to one of the ionic optics, you will hear a slight sizzle. In case you do not hear sizzling, it may be because your body is itself isolated from the ground. In this case touch a wall with one hand, or take off your shoes. (The soles are electrically insulating and can prevent the electrical phenomenon that generates this sizzle.) Finally, it is possible to acquire an air quality sensor, which will allow you to check the effect of your ionizer on air pollution.