iFrogz Vertex Headphones with Microphone - Iron Fashioned with extra-large speaker drivers, Vertex Headphones offer precision audio and rich acoustic tuning. Lightweight and ergonomically designed, these headphones feature our comfortable AeroFoam cushions. Headphones fold for convenient travel use. Includes convenient in-line microphone to allow enjoyment of in-depth acoustic tuning, without missing calls from your mobile phone. 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