The DT 660 features a fully closed bass reflex construction with high ambient noise attenuation. Furthermore, your enjoyment wont disturb others who may not share your good taste in music. The DT 660 provides a most sophisticated sound with a detailed reproduction. Headphones Design: Over Ear Headphones System: Closed Back Headphones Impedance: 32 Ohms Headphones Options: Adapter Transmission type: Wired Headphone design (operating principle): Closed Headphone impedance: 32 ohms Headphone frequency response: 5 - 35,000 Hz Nominal sound pressure level: 97 dB Construction: Circumaural (around the ear) Cable & plug: Straight connecting cable with mini jack plug (3.5 mm) & 1 adapter (6.35 mm) Weight without cable: approx. 350 g