The thinnest neck pendant air purifier in the world with ergonomic lightweight design for wear comfort.Generate 2,000,000 negative ions/cc (100 times more than natural forest concentration)Close to face design, which can effectively provide invisible protection to prevent particulates breath inPersonal protection from PM2.5, VOCs, bacteria, pollen, cigarette smoke, pet danderPM2.5 removal rate 99.9%, formaldehyde removal rate 99.0%, bacteria removal rate 96.8%Test results are certificated from independent labs including SGS , JIRA and JAIRA.70g super lightweight and ergonomic design for comfortable wearing0dB, fanless design for zero noise operation. Self sustainable design only requires simple regular cleaning.32 hours long lasting built-in batteryPersonal protection from PM2.5, VOCs, bacteria, pollen, cigarette smoke, pet danderPM2.5 removal rate 99.9%, formaldehyde removal rate 99.0%, bacteria removal rate 96.8%Test results are certificated from independent labs including SGS , JIRA and JAIRA.70g super lightweight and ergonomic design for comfortable wearing0dB, fanless design for zero noise operation. Self sustainable design only requires simple regular cleaning.32 hours long lasting built-in batterySPECIFICATIONWeight: 70gDimension: 16.9 x 13.3 x 6.1 cmPower: Built-in battery, rechargeable via micro USBOperating Ambient Temperature: 0°C to 40°CRelative Humidity: 30 to 85% noncondensingIon Generation: 2,000,000 negative ions/cm3Warranty: 3 month