Designed to exceed the demands of the professional environment, the HD 280 Pro boasts extremely robust construction combined with the sound quality, modular design and aggressive noise isolation the necessary in the field. The unique collapsible design, combined with swivelling ear cups, offers maximum flexibility in any application. The Sennheiser HD 280 Pro are closed-back, circumaural headphones designed for professional monitoring applications. Although suitable for a very wide range of applications, the exceptional 32 dB attenuation of external noise makes the Sennheiser HD 280 Pro particularly useful for use in a high-noise environment. Sennheiser HD 280 Pro Features sided coiled cablesaving design with collapsible, rotating ear-piecesIncludes 1 pair of Sennheiser HD 280 Pro headphones1 screw-type adaptor to 1/4Technical SpecsTransducer principle dynamic, closedNominal impedance 64 OhmSound pressure level (SPL) 102 dB (IEC 268-7)Load rating 500 mWTHD, total harmonic distortion 0,1 %Ear coupling circumauralContact pressure 6 NWeight w/o cable 220 gJack plug 3,5 / 6,3 mm stereoConnection cable Coiled cable (min1m/max 3m)Frequency response (headphones) 8.....25000 Hz