Like the HB70, the HB79 headphones are all the Sound of Koss without the wires. Ideal for home audio, video and computer use, the HB79 system incorporates state-of-the-art infrared (IR) technology with single-channel wireless headphones and a compact infrared transmitter. Two things separate the Koss HB79 cordless headphones from the Koss HB70s: 1.) A dynamic element promotes extended frequency response, and 2.) An adjustable, soft rubber headban...