First covert usage police/secret police radio of the fully transistorised line of TESLA radiotelephones, produced in the 70/80'ies of last century. Flat design, set by TESLA VUST in the beginning of 70'ies and verified by successful public model PR35. The radio delivers 0.5W in the 70-80MHz band, 3 crystal controlled channels, two crystal per channel mode. Runs on generic 6V battery pack. There is a very wide set of accessories, mostly compatible with its successor PR36 OBERON, including covert and conventional microphones, vibrational signalling system, covert wire antenna and more. The radio uses plain narrowmode FM, thus, no voice scrambling available.
This piece in my collection is fully working, checked on radio tester. Unfortunately, no documentation in my collection, the one here available is converted from Funksprechgerät PR-35, Kurzbeschreibung at

All photos are © OK1UHU, 2011