Exceptionally pure audio of Sound Reality in a wireless design Exclusively designed 40 mm drivers for outstanding sound quality Internal battery provides an astounding 70 hours of continuous use on a full charge Housing's dual-layer isolation structure keeps the electric circuitry separate from the acoustic space for optimal phase and transient response Compatible with AAC and SBC codecs Lightweight, fold-flat design for easy portability Mic and controls built into the earcup for convenient handling of calls, music playback and volume adjustment Includes 30 cm (1.0') USB charging cable