Sharper Image SHP52BL Stereo Headphones with Microphone, One Sided Cable, Blue These headphones deliver dynamic, high-fidelity stereo sound with a lightweight design that ensures a supremely comfortable fit. A single-sided cord with an in-line microphone allows you to take phone calls hands-free. The sturdy but streamlined headband is cushioned and adjustable, while the soft ear cups block ambient noise for optimal listening enjoyment. Features - High fidelity stereo sound. Comfortable noise-blocking ear cups. Padded, adjustable headband. In-line microphone for hands-free class. Single-sided cord. Technical specs - Frequency Response: 20Hz ~ 20KHz. Speaker size 40mm. Sensitivity: 983dB. Impedance: 320hm. Cable Length: 4 Ft. Plug: 3.5mm Connectivity Technology: Wired