● Airvida L1, a portable air purifier you wear around your neck. A new sensation, bringing clean, refreshing air with you wherever you go. ● Ergonomic design ensures comfort in any situation, whether you're exercising, working, or commuting. ● Generates 2 million negative ions/cm3, providing 100 times the refreshing feeling of nature! ● Fanless design with 0dB, achieving ultimate silence. ● PM2.5 removal rate: 99.9% ● Formaldehyde removal rate: 99% ● Bacteria removal rate: 96.8% ● USB rechargeable, eliminating the need for battery replacement. Can be charged from a computer or smartphone. ● Suitable for various situations, including those with hay fever, those exposed to secondhand smoke, asthma sufferers, those who frequently use cars, airplanes, or trains, and those who spend long hours using computers. Charging cable not included.