The Pilot PA400-ASC 4 Place Intercom is a Stereo version and can be used with monaural or stereo headsets, or any combination of headsets.
 
 
On / Off volume control
Pilot isolate switch
Music In / Record out Jacks
Back lit Panel
Fail-Safe capability
Powered by two 9v batteries
Auxiliary power cord adaptor
ASC circuit
Three Year Warranty
Intercom lead length = 152cm