Here’s a description from an Aircraft Spruce catalog:
“A sure-fit for all students, instructors and aircraft renters. Has a music input and Aux output for recording lessons and radio communications. Both pilot and co-pilot positions have PTT jacks. Powered by an internal 9V battery (included), good for 40 hours of operation in airplanes lacking a cigarette lighter socket. A 4-foot Aux power adapter is
included. When using the power cord, the battery is by-passed, preserving the life of the battery. The 2-place SPO-22,is compatible with all standard aircraft headsets. Made in USA.”
Although it’s been gently used, this unit is in very good condition. $100 USD + shipping.
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