The Final Audio Design E3000 designed the sound quality of this product based on the latest acoustic engineering and psychological research results. Using the usual method of sound creation whereby certain high frequencies are emphasized, you're given to feel vivid sound when you first listen. With E3000, not creating a range that is emphasized makes for high definition and a vast sound stage. With well-balanced sound reproduction from low through to high frequencies, you can experience the same kind of sound spread you would if you listened to music in a concert hall. With this product, we've aimed at natural sound quality for a "standard" whose value you feel the more you use it over time rather than just in its appeal when you first listen to it. Machined from stainless steel and with a mirror finish, the housing firmly supports the driver unit and suppresses unnecessary vibrations; it is an important element with respect to sound quality. Fitting of a device for the mature listener, this is a design that has a simple shape and a high-quality texture matched with classic sound quality. The precision involved in assembling the parts for the driver unit is of the utmost importance. The small-aperture 6.4mm diameter dynamic driver unit boasts an extraordinarily high level of precision. There is an aperture on the back of the housing which act to extend the reproduction band of low frequencies. To prevent sound leakage from the apertures there is a filter inside, and stainless steel mesh has been added to the outside. Taking touch noise into consideration, soft, flexible coated material has been employed. When using ear hooks also, it moves flexibly, making for a good fit. Specifications: Housing: Stainless steel mirror-finished, Driver: 6.4mm diameter dynamic driver, Cable: OFC cable, Sensitivity: 100 dB/mW, Impedance: 16 Ohms, Cord length: 1.2m. Accessories: Silicon ear pieces (E type 5 sizes), Ear hook, Pouch.