The PM1000II gives you great capabilities, unbelievable flexibility and some of the most advanced features of the product line. Check out the one minute playback digital recorder optional feature, allowing pilots to replay radio calls on demand. The PM1000II offers some of the most advanced features in the world today. The unit is one of the best reasons why PS Engineering is the market leader in the field of aircraft audio. The PM1000II Panel Mounted, Four-Channel Intercom is our second generation design in this series, featuring many of the most advanced features in intercom technology. Some of its best features include: Pilot isolate, crew isolate, and dual entertainment sources allow full flexibility, even giving pilots the option to feed music to the passengers and allow them to chat among themselves without disturbing the front seats. Automatic fail-safe interconnect to the aircraft radio wires the pilot's headset to the aircraft radio in the event of disrupted power or related failure.Separate pilot and copilot transmit capabilities ensures that only the person pressing the PTT will be heard over the radio.A red transmit light is illuminated when a PTT is pressed -- this also serves as a "stuck-mic" indicator. Independent intercom volume settings do not affect radio equipment volume levels, allowing better control over communications. An optional digital recorder can provide up to one minute of storage of radio receptions. A continuous loop recorder, it does not record "dead air time", giving the pilots an option to store up to 16 messages at any one time. Models available for extremely high noise environments.