1. Advanced : -07 Personal air purifier necklace is a product of advanced technology that to cleaner and air for us to breath. This wearable mini air purifier does the function of air purifier and comes with an advanced feature of showing the temperature and humidity checker of the surroundings. 2. New Way of Air Purification: This small air purifier necklace uses an advanced way of purifying air. personal ionizer air filter necklace releases small negative ions that help to remove PM 2.5, dust, pollens, smokes and other air impurities which are all harmful to lungs, so be at ease that we're breathing a cleaner air, and there's no any filter needed to change. 3. TAKE IT : The -07 is the perfect travel accessory for those who love to without exposure to unsanitary air; -07 model includes a proprietary lanyard which is adjustable.Wear it around your neck and have a sphere of breathable anywhere you go. 4. SPECIFICATIONS: Power Boost Technology provides 9 more cleaning power; 875% cleaner air, the -07 is certified to filter more pollutants than any of closest competitors; Silent operation, no noisy fans or motors; No filters to change; USB charging cable, lanyard. 5. Add , the back cover can be removed, and aromatherapy can be placed. After the back cover is removed, aromatherapy tablets can be placed, and the will last for a long time. Product name: Hanging neck air purifier Negative concentration: 160 /cm Rated voltage: DC5V/1.0A Power: 0.1W Mute effect: 10DB Battery capacity: 1600mAh/3.7V Charging time: 4h Use time: 12-135h Applicable area: 10m How it works: negative ions Control : button Smart type: temperature measurement, aromatherapy Applicable people: especially suitable for children, the elderly, pregnant women and those allergic to pollen and odor Product size: 36x87.7x23.8mm colour: black Material: PC Package Contents: 1 x Air Purifier 1 x Necklace 1 x Charging cable 1 x Bracket 1 x Aromatherapy tablet Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.