Koss-Porta-Pro-headphones Review Today we present to you the-new Koss-Porta Pro® Wireless-Bluetooth-On-Ear-Headphones. The Koss-Porta-Pro-headphones have been on the market since 1984 and have become a benchmark when it comes to good sound engineering. The general specifications are, according to the manufacturer: Wireless-BluetoothOn-Ear-Headphones. Bluetooth 4.1 withaptX.IntegratedMicrophone.Porta-Pro-Hard-Case included. Comfort-Zone-settingon-temporal-pad.Collapsible-designfor compact storage.12+ Hour BatteryLife (rechargeable).In-Line Controls (Answer/End,Volume, Play/-Pause-Start-Stop, etc.). […]