Technical Information: Speaker Type: 50.m/m Dynamic Speaker Mylarcon Magnet: NFB 15x1.5 Four-Hole Style (50u) Sound Pressure Level:110.Db +/- 3dB (1mw at 1kHZ) Rated Input Power: 30.mw Max. Input Power: 100.mw Impedance: 250-ohn +/- 15% Frequency Response: 20HZ - 20kHZ Cord: 12.5 F coil cord with 3.5 stereo plug (1/4" and 1/8" plugs included) Comfort Features: Automatically self-aligning for perfect fit and protection. Broad foam cushions provide maximum comfort.