About this item Effective air cleaning: This travel air collar can produce 200,000 ions per second that effectively push harmful substances away from your personal space. Millions of ions can effectively clean the polluted and indoor harmful substances such as dust, secondhand smoke, etc. health. Breathing these contributing ions has a relaxing effect and relieves tension, bringing you a good mood. Simple to Use: Using this air collar couldn't be easier with one-button operation to turn it ON/OFF. Low power consumption and low noise make running and quiet affordable. ^ Large battery: USB rechargeable, can be charged by adapter, PC computer, power bank. With upgraded Lithium battery, it can be used up to 48 hours after fully charged, provides fresh air all day long. ^This air collar is easy to use and lightweight, wear it around your neck and hang it in your car. Whether you are traveling by plane, train, bus or at the gym, in crowded elevators or in the office, you can use it and enjoy the clean and safe air. Perfect gift for children, pregnant women, allergies, smoke haters, etc.