The Elektronika IM - 01 seems to be somewhat rarer than the upgraded version, the Elektronika IM - 01T, which you will find elsewhere on this website.
The IM-01 was manufactured in the Soviet Union in the Svetlana factory, Leningrad (now St. Petersburg) starting in 1986 according to the box date label with Sergei Frolov’s machine referred to in his Livejournal. So this was probably the first wholely Russian produced chess computer. Elektronika, the brand name, is mainly associated with calculators, computers, watches and video games, many of them reverse engineered clones. IM stands for microprocessor game.
The manual is in Russian Cyrillic script, so hard work to interpret. However working through the functions it is clear that this is a more sophisicated machine than the other Russian offerings, with a wide range of options.
It has an integral power supply and a piece compartment at the rear.