CX21 in-Ear Headphones Compatible with iPod, iPhone, MP3/CD/DVD players, computers, and all devices with a standard 3.5mm jack Driver: 9.0 mm dynamic drivers Housing: High impact plastic housing with angled fit Frequency Response: 15Hz  20KHz  Sensitivity: 101 dB  Impedance: 16 ohms Maximum Power Input: 30 mW  Connector: 3 pin stereo 3.5mm gold plated45 plug Extra Long Cable: Designer black 135 cm (53 in) with attached shirt clip