[ High Concentration Negative Ion ]2million/cm3 at a distance of 15 cm. Effectively absorb formaldehyde, solve the surrounding quality problems, eliminate second-hand smoke and purify the surrounding . Removes most of pollen, odors, smoke, cooking odors, and even PM 2.5 pollutants. Keep you in the purifying range at any time and breathe safely.Just plug it into the charging port to charge. It will be fully charged in 2 hours and can be used continuously for 48 hours, so it can provide you with for a long time. This portable ionic freshener is Perfect for people who are sensitive to breathing.Low noise during the purification process, will not disturb you during work or rest. No radiation will 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 quality, you can wear a necklace freshener to create a clean freshening area.Mini portable necklace design, fashionable and easy to carry. You won'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 the .[ Great Choice for Gifts ]Say goodbye to ordinary big size purifier Let you enter the purification range at any time and breathe safely, it will be a most intimate gift for your leaders, friends and family Product Name:Portable PurifierWorking Principle:Negative ionsApplicable Area:1 Cubic MeterFunctions: purificationAnion Density:2million/cmNoise: below 25dBVoltage: DC5V: 0.1 wCharging time: About 2 hourBattery life: more than the 48 hoursWeight:30gsize:55x17x60mmMaterial:ABScolour:BlackPackage Contents:1 x Purifier1 x USB Charger1 x Lanyard1 x English manualOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.