53 mm drivers reproduce clear treble and midrange. Connectivity Technology: Wired Bobbin-wound CCAW voice coils for superior power handling. Impedance: 38 ohms Sensitivity: 100 dB/mW . Full open-air type headphones produce no sense of pressure on the ears, resulting in a completely natural sensation Lightweight aluminum honeycomb casing with excellent acoustic properties Self-adjusting 3D Wing Support provides a comfortable listening experience; total ear-fit design minimizes pressure. Maximum Input Power: 700 mW Frequency Response - 20 – 20, 000 Hz and Impedance - 45 ohms Connector Type: 3.5mm Connector Type: 3.5mm Connectivity Technology: Wired Included Components: Audio-Technica ATH-AD700X headphone, Detachable 1/4 inch (6.3 mm) adapter