AKG K-142 HD Stereo Headphones, semi-open, dynamic, 55ohms rated impedance, 200mW maximum input, frequency range: 18Hz-24kHz, 101dB/V sensitivity, 3m jack cable with 3.5mm stereo mini-plug. gold plated 1/8" to 1/4" screw-on adapter. Ideal for MP3, CD, MD and PC/Notebook equipment. Weight: 225g (without cable)