Low noise during the purification process, not disturb you during work or rest. No radiation be generated during the purification process, so pregnant women, children and the elderly can be rest asured to use it. During the journey, in public places or other places with poor air quality, you can wear a necklace air freshener to create a freshening area. [ High Concentration Negative Ion ]2million/cm3 at a distance of 15 cm. Effectively absorb formaldehyde, solve the surrounding air quality problems, second-hand smoke and purify the surrounding air. Removes most of pollen, odors, smoke, cooking odors, and even PM 2.5 air pollutants. Keep you in the purifying range at any time and breathe safely. Just plug it into the charging port to charge. It be fully in 2 hours and can be used continuously for 48 hours, so it can provide you with air for a long time. This portable ionic air freshener is Perfect for people who are sensitive to breathing. Mini portable necklace design, fashionable and easy to carry. You 't feel tired even if you wear a necklace for a long time. It is very suitable for travel, this is not only a fashionable necklace, but also an effective purifier. Easy to operate, just press the button for two seconds to enjoy air. [ Great Choice for Gifts ]Say goodbye to ordinary big size air purifier! Let you enter the purification range at any time and breathe safely, it be a most intimate gift for your leaders, friends and family!