DESC: Philips Full Size Headphones w/volume control SHP2500/37 40mm speaker drivers for outstanding sound performance. Comfort and Convenience, Lightweight headphone for prolonged usage, Ergonomic earshell design to enhance wearing comfort, Extendable headband to fit perfectly on your head. Always ready, 1.8 m cable + 4.8 m extension cable to maximize movement, In cord volume control allowing easy adjustment of volume, In cord L/ R, stereo channel switch allowing easy language selection.