The Model 240 mixes audio from various sources from output to cabin speakers.  It is a remotely controlled, electronic unit which operates upon command from switches and potentiometers in the cockpit or cabin of the aircraft.

The Model 240 provides Fasten Seat Belt and No Smoking sign chime tones, a Cabin Call ringer tone, ADF, Pilot Select Com (PSC), TV, Briefer and Cabin Paging audio, to the cabin speakers.

• "Fasten seat belt" and "no smoking" sign chime tones
• Cabin call ringer tone, ADF, PCS, TV, paging audio to cabin speakers
• Electronically switched
• Manual cockpit switches enable electronic switches in the 240 amp
• Paging and briefer audio priority
• Microphone bias current available for PA microphone input