EarPollution Ronin Headphones - Blue/Red (Discontinued by Manufacturer) Made with 50 mm speaker drivers, Ronins deliver super-deep bass, smooth, undistorted highs, and clear vocals. Ronins have a padded band and thick cushions, to give you maximum comfort, while spring-loaded hinges fit any head. Ronins fold up for convenient travel use. Compatible with iPhone, iPod, BlackBerry, and any other media device with a 3.5 mm jack. Driver Unit: 50mm neodymium - Impedance: 32 ohms - Sensitivity: 105dB+/-3dB at 1KHz - Frequency Response: 30 Hz to 20 kHz - Cord Length: 1.5 meters