Why is there no sound when it works? In order for customers not to be disturbed by noise and bright lights when using it, it is designed to work silently, without lights, and when you plug it into the electrical outlet, you may mistakenly think that it is not working. Why is there no sound when it works? In order for customers not to be disturbed by noise and bright lights when using it, it is designed to work silently, without lights, and when you plug it into the electrical outlet, you may mistakenly think that it is not working. How to know it's working? Method One: Please put your bare feet on the ground, wet your hands with water and get close to the needle of the ionizer, and you will feel the ion breeze.Method Two: Please bare feet on the ground and use the electric pen to approach the needle of the ionizer, the electric pen will light up. Note: Since it has an automatic switch function, it will stop for 30 minutes every 3 hours of operation. Please test after powering on. How to know it's working? Method One: Please put your bare feet on the ground, wet your hands with water and get close to the needle of the ionizer, and you will feel the ion breeze.Method Two: Please bare feet on the ground and use the electric pen to approach the needle of the ionizer, the electric pen will light up. Note: Since it has an automatic switch function, it will stop for 30 minutes every 3 hours of operation. Please test after powering on. Air purification and healthy breathing Remove smoke and dust Pet odor removal Improve sleep quality