General description Portable air purifier necklace designed to improve air quality in various environments such as subways, public transportation, and tourist attractions. It effectively purifies the air within a space of up to 10㎡ by releasing 20 million negative ions, helping to reduce air pollution. Technical specifications Application area: below 10㎡ Negative ion output: 20 million ions Power supply: USB Size: 66 x 26 x 16 mm Material: ABS Battery life: up to 15 hours Usage Easy to use with a compact design, this air purifier can be worn as a necklace and is suitable for use at any time. It operates silently, providing a comfortable experience without interference. Other information Package contents: 2 x purifiers, 2 x data lines Note: Color may vary slightly due to lighting and display differences. Measurement error allowed: +/- 1-3 cm