Unique on the market, all original, box, information booklet and parts, fully working. Comes with original box with postage stamp, original information leaflet of the article and two old US leaflets plus various connection terminals. Switch for high impedance: low impedance Rated impedance: 8 - 10 k ohms Power handling capacity: 0.5 watts Frequency responde: 30 -18,000 cps Close fitting ear pads for comport. Moving coil cone type speaker in each ear piece. weight: 0,6 Kg size box: 9x22x22 cm colour: grey