The P24 is a special purpose AM receiver, probably for paratrooper squads. The receiver works on single frequency, programmed by a channel plugin. The plugin contains input filter for a given frequency and a crystal oscillator for a 1st IF conversion (the IF is 10.7MHz). There are up to five channel plugins in the set (one operating, up to four spare).
The receiver is equipped with a Kulikow and wire antennas, there is a single-ear headphone as a standard. As a power source there are used six AA batteries.
The receiver in my collection is in an A+ grade, probably unused, fully working. Unfortunately, no more specific info on this, no documentation.