EarPollution CS40 Headphones - Red(EP-CS40-RED) (Discontinued by Manufacturer) Made with 40 mm speaker drivers, CS40's deliver super-deep bass, smooth, undistorted highs, and clear vocals. Ergonomically designed, CS40's are lightweight and extremely comfortable. Designed with our famously comfortable Aero Foam ear cushions. CS40's fold up for convenient travel use. Compatible with iPhone, iPod, BlackBerry, and any other media device with a 3.5 mm jack. Driver Unit: 40mm neodymium - Impedance: 32 ohms - Sensitivity: 116dB+/-3dB at 1KHz - Frequency Response: 20 Hz to 20 kHz - Cord Length: 1.6 meters