The newly upgraded KY400A air necklace has a negative ion concentration of up to 160 million at a distance of 1.5CM New features of the 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 placed in the car 3. Built-in fan, wind allows negative ions to spread farther 4.More power :Battery capacity:1600mA 5.Need to tell you,it is bigger Product model: Black/White Upgrade Versio Working voltage: DC5V Power: <1w Current: <50mA Battery capacity: 700mA Charging method: TYPE-C Charging time: 4 hours Material: new environmentally friendly ABS + PC Service life: 12 hours with fan, 135 hours without fan Product size: 8 x 3.5 x 2.3cm Product weight: 88g Announcement: There are counterfeit products on the market now, and the power or negative ion concentration is not up to the standard, resulting in a greatly reduced function, and thus selling at low prices. Please do not buy inferior products for the sake of cheapness. ---------------------------------------------------- pgraded Air Necklace with Ultra-high Negative Oxygen Ion Concentration, Negative Ion Air Necklace Wearable, Adjustable Air Filter, Eliminating Airborne Pollutant Particles 🍃 ▶BREATHE CLEANER AIR◀ This wearable Air Purifier Necklace achieves 1 cubic meter of air purification by releasing 120 million negative oxygen ions, bringing the same molecules found in natural retreats (beach, waterfall, or mountain) to by your side. You will feel like you are in nature! 🍃 ▶NEW PURIFICATION TECHNOLOGY◀ This wearable personal air purifier using pulsed needle tip technology to release 120 million negative oxygen ions, the generated negative ions will combine and eliminate pollutants and other unhealthy particles in the air by their static charge, forming a microscopic health shield. You can enjoy refresh and clean air at any time! 🍃 ▶HEALTH GUARDIAN ANGEL◀ This Negative Ion Air Necklace improve depression, insomnia, mood, and improve sleep quality; and 5 decibels ultra-quiet operation, to ensure your sleep quality while taking care of your dreams not to be disturbed 🍃 ▶LONG-LASTING◀ This Air Filter Necklace using a high-quality polymer lithium battery, high efficiency, and energy-saving, 60 hours of battery life on a single charge (30 hours in the high-gear); and the use of the latest adjustable negative ion generator(80 million/120 million), you can regulation according to different environments 🍃 ▶BEST CHOICE◀ Environmentally friendly without consumables, the negative ion generator does not need to be replaced for life, saves worry and effort; and the elegant and beautiful design will be an exquisite gift for your lover Product Features: This air fresher creates up to 120 millions/ cm³ negative ions Two ions releasing speeds: High & Low High level: 80 millions negative ions/ cm³ Low level: 120 millions negative ions/ cm³ Helps to eliminate PM2.5 air pollutants, smoke, odors, dust, etc. Silent operation