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The newly upgraded KY400A air necklace has a negative ion concentration of up to 160 million at a distance of 1.5 cm New features of KY400A upgraded version: 1. The back cover is detachable, you can put the aroma diffuser 2. The lanyard can be installed and worn at any time, or it can be placed in the car 3. Built-in fan, the wind makes the negative ions spread farther Product model: Black and white upgraded version of Versio Working voltage: DC5V Power: 1w Current: 50mA Battery capacity: 200mAh Charging method: Usb, rechargeable battery Charging time: 0.5 hours Use time: 12-20 hours Material: new environmentally friendly ABS + PC Product size: 6 x 5.5 x 2cm Product weight: 120g -------------------------------------------------- - With ultra-high concentration of negative oxygen ions, the negative ion air necklace can be worn, the degradable air necklace with adjustable air filter, the adjustable air filter eliminates pollutant particles in the air ▶ Breathe cleaner air◀ This wearable air purifier necklace releases 120 million negative oxygen ions, bringing the same molecules found in natural retreat areas (beach, waterfall or mountain) to your side to achieve 1 cubic meter of air purification. You will feel like you are in nature! ▶New purification technology◀This wearable personal air purifier uses pulsed needle tip technology to release 120 million negative oxygen ions. The generated negative ions will be electrostatically combined and eliminate pollutants and other undesirable particles in the air. Thereby forming a microscopic health barrier. You can enjoy the fresh air at any time! ▶▶Health guardian angel ANG this negative ion air necklace can improve depression, insomnia, depression, and improve sleep quality; 5 decibels ultra-quiet operation ensures your sleep quality while taking care of your dreams without interference ▶Long-lasting◀This air filter necklace uses high-quality polymer lithium batteries, which are highly energy-efficient, and can maintain a battery life of 60 hours (30 hours in the high-end position) on a single charge; and uses the latest adjustable negative ion generator (8000 Million/120 million), can be adjusted according to different environments ▶▶Best choice◀Environmental protection, no consumables, the negative ion generator does not need to be replaced for life, saving labor and effort; the elegant and beautiful design will be an exquisite gift for your lover Features: This air freshener can produce up to 120 million negative ions/cm³ Two ion release rates: high and low High level: 80 million negative ions/cm³ Low level: 120 million negative ions/cm³ Helps to eliminate PM2.5 air pollutants, smoke, peculiar smell, dust, etc. Quiet operation, easy to use No need for additional filters Product specifications: Working voltage: DC5V Power: 1w Current: 50mA Noise: less than 5 decibels Battery capacity: 200mAh