Koss Porta Pro Cuffie On-Ear Nere, Stile Retrò, Design Pieghevole, Custodia...
Manufacturer: Koss. Model Number: Porta Pro Black. Connector Type: 1 x headphones (mini-phone stereo 3.5 mm). Frequency Response - 20-17,000 Hz and Impedance - 16 ohms.Frequency Response - 15-25,000 Hz and impedence of 60ohms.