3 SPEAKERS IN EACH EAR CUP PROVIDE TRUE 5.1 DOLBY® DIGITAL SURROUND SOUND; FREQ RESP: 20 HZ–20 KHZ; DECODES DOLBY® AC3, PROLOGIC® II, DTS & AAC; UNCOMPRESSED AUDIO FOR CD-QUALITY MUSIC & EXTRA VOICE CLARITY; ANALOG, DIGITAL COAXIAL & SPDIF INPUT SOURCES; PROPRIETARY DIGITAL SEQUENCE SPREAD SPECTRUM TRANSMISSION TECHNOLOGY; PADDED, SELF-ADJUSTING HEADBAND FOR COMFORTABLE, CUSTOM FIT; UP TO 8 HOURS OF BATTERY LIFE WITH INCLUDED LI-POLYMER BATTERY