AKG K 451With these AKG Headphones you can enjoy your favorite music as you may never have heard it before, as well as make and receive hands-free calls or calls via Skype (with an optional communication kit), all through the same system. And for your convenience there are two lengths of the single sided cable included. Of course the foldable K451 always makes a perfect travel companion, wherever you may be.Features- Perfect 3D-axis folding mechanism for easy transport- iPhone-compatible- 2 x single-sided detachable cables included- Super soft ear pads for comfortable fit- 2.5mm/6.35mm jack plug adapter- Premium carrying case includedSpecifications- Color: black- System: Dynamic- Design: Closed headphones- Frequency range: 11Hz to 29.5kHz- Sensitivity: 126dB SPL/V- Input impedance: 32 ohms- Max. input power: 30mW- Cable: 99.99% oxygen-free - Cable lengths: cable 0.5 m and 1.1 m- Main connection: Hard gold-plated jack plug and contacts- Weight (without cable): 120 g