R855-UM Type C is pilot's emergency radio developed sometime in 1970s. To operate, it must be connected to "Priboi" type battery. Radio has it's own built-in speaker and microphon, but could also be connected to helmet's communication system. For easy detection, radio's body is colored into the bright yellow color.

R655-UM Type C radio can be operated in 3 different modes - incoming, outgoing and tone. To operate in either of the first two modes, pilot should press the appropriet button; to operate in the third mode "tone" pilot should simultaneously press press buttons for incoming and outgoing modes. In "tone" mode, R855-UM radio starts continously send out signals which are used by rescue team to locate the pilot.

As noted above, radio station has 2 buttons (for incominf and outgoing modes). It also has a switch which is used to fixate either (or both) of the above buttons in the down position - allowing pilot to operate in either mode without holding down the buttons.

 

Overall view of the R855-UM Type C radio station. It's colored in bright yellow color so pilot could easily find it in case of any trouble. Also not that radio has a small plate on the front side with instructions on how to properly operate it.
Close up on the instruction plate. The first 2 lines are radio's name and type. All the way on the bottom, on either side of the speaker are labels with radio's serial number and date of production.
On the bottom side of the radio black extension cable to the battery and a small small nut, which, according to instrustions, should be opened for several seconds if pilot experiences severe change in either temperature or air pressure.
On top is an opening for the antenna.
Right side of the R855UM Type C radio station. Button on the left is for incoming mode, in the middle - for outgoing. On the right is a slider which fixates either or both of the previous buttons in the down position.