Koss Porta Pro Headphone Review: Wow! The Best Value on the Market, Period.458Alex RoweVõ Hoài DanhFollowSep 6, 2018 · 1 min readIn Vietnam, I only pay about $25 for ithttps://tiki.vn/tai-nghe-chup-tai-koss-porta-pro-classic-p2507343.html