30 pre-programmed channels (22 FRS and 8 BRS) and 121 sub-channel settings. Range up to 9500 ft (2mi). Up to 20 hours run time. Level Dependent listening of ambient sound. Ghost voice menu prompts. Uses rechargable Lithium Ion Battery Pack. Push-to-Talk or Hands-Free Voice-Activated transmit functions. Envrionmetnal microsphones on each ear cup – apmplication limited to 82 dBA. Operates on comm frequencies that are subject to FCC Rules & regulations. Compliant Standards ANSI S3.19-1974.