Koss is famous for high-fidelity headphones. This headset has unique flat-disc/dual speakers and a rubber-type earpiece that extends slightly into the ear; this design can actually aid those who are hard of hearing. Available with 3.5 mm (1/8 inch) mono plug for use with Sony, Olympus, Panasonic, Norcom, Sanyo & Lanier machines or the NORELCO Din plug for use with Norelco 500 Series Machines.
3.5: Fits ALL Transcribers and Dictation Machines that use a 3.5 mm (1/8 inch) Mono Plug such as: Lanier, Sony, Sanyo, Panasonic, Olympus and others.
N: Fits Norelco 500 Series Machines