https://www.koss.com/headphones/wireless-headphones/porta-pro-wireless
Wireless Bluetooth On-Ear Headphones
Bluetooth 4.1 with apt-X
12+ Hour Battery Life (recharageable)
In-Line Controls (Play/Pause, Start/Stop, Volume, Answer/End, etc.)
Integrated Microphone
Comfort Zone setting on temporal pad
Collapsible design for compact storage
Porta Pro® Hard Case included
沒想到竟然會出無線版...
當年也用這隻好一陣子，中間修過一次線
後來線又斷+開放式會吵到人才換掉