The ERGO models 1 and 2 utilise rugged and reliable dynamic-type reproducers. Both models can be connected directly to the standard 6.3 mm (or optional 3.5mm) headphone sockets of a stereo amplifier, receiver, tape deck, CD player, TV, and PC. Here is a short description of the ergonomics of the headphones A) The ERGO headphone rests lightly on top of the head, its mere ounces of weight distributed over a large, insensitive surface. This lightweight, soft foam headband cushion results in complete freedom from pressure and allows the scalp to “breathe” naturally. B) A foam strip at the rear of each speaker panel rests lightly behind each ear. These do not contact the ears, causing no deformation, which would obstruct the natural sound field created by the speakers. C) The speaker panels are fixed in the correct position to maintain optimum vertical and horizontal angles of sound dispersion. D) Since the speaker panels do not physically contact the ears, the intervening spaces permit fresh air to flow from below them, avoiding the heat, sweat, and listener fatigue commonly experienced with conventional headphones. Conventional headphones distort the shape of the outer ear and pump sound directly into the auditory canal, depriving the ear of its natural function. Such headphones may have a wide frequency response. Still, by contacting and deforming the ear, they lose or distort the second (indirect) sound wave information, resulting in unnatural sound reproduction and listener fatigue. Made In Switzerland. For condition details and/or additional pictures, please contact us directly at 03 9882 0372 or email us at hello-info@hifidisposals.com.au. This product comes with Warranty. Click here for warranty details.