Thank you for viewing. This product is the "Soundcore Liberty Air 2 Pro". Purchased in 2022. (Original price: 16,000 yen) Due to 3 years of use, there is a slight defect in the charging function within the case, but charging is possible if the connection part is cleaned. Other functions are normal. The main unit has been disinfected and sanitized. The Anker official app needs to be installed to use the main unit. - Ultra noise canceling, Ambient sound mode - 7 hours of playback with the earphones only + 26 hours of playback with case charging - Equalizer settings available - ↓ See the manual here. https://lp.ankerjapan.com/hubfs/20221209pressrelease/A3951Manual_JP2_202301.pdf The ear tips are S+ (slightly larger than the general size of earphones). Size changes are possible if you purchase separately sold ones. Price negotiations are possible.