Panasonic HD5 headphones with 40mm drivers for high-resolution sound quality. - Brand: Panasonic - Model Name: HD5 - Driver Size: 40mm - Impedance: 44Ω - Sound Pressure Level: 99dB/mW - Maximum Input: 1000mW - Frequency Response: 4Hz - 40kHz - Cord Length: 1.2m - Plug: Stereo mini-plug - Lightly used and stored. - Tape residue/peeling on the back of the box. The main unit is clean. - Returns accepted for initial defects. Thank you for viewing.