HP200 Stereo Headset provides dynamic sound reproduction with all portable music players. Feature adjustable locking headband and single entry cord. Impedance: 30mm. Drivers: 32 ohms. Magnet: Anistoropic Ferrite. Film: 0.016mm. Coil: 13.6mm. Sensitivity: 100 dB +/- 3dB. Channel Balance: <3dB. Rated Input: 40mW. Maximum Input: 100 mW. Frequency Response: 20Hz - 22,000Hz. Plug: 3.5mm Straight Plug. Cord Length: 4'.