Up for auction are these AKG K 840 KL on-ear, closed-back wireless headphones. It is very lightly used in great condition. AKG utilizes proprietary Kleer technology rather than Bluetooth for high-fidelity audio transmission. Allowing low band frequencies and high band frequencies to be included in the sound output. I am including 2 new USB-C to Stereo audio cables. They allow you to connect the transmitter to your iOS or Android device for broadcasting.