Summary

This is a case for a super inexpensive amateur radio 40m transceiver, the Pixie. The case is for a specific variant of the Pixie, available from quite a number of different China sources for a few dollars, such as http://www.banggood.com/DIY-Radio-40M-CW-Shortwave-Transmitter-Kit-Receiver-7_023-7_026MHz-p-973111.html

Note that there are many Pixie variants, and versions other than exactly the one shown will probably not fit.

For the history of the Pixie, see https://w5nor.org/wp-content/uploads/2018/02/The_Sprat_Pixie_File.pdf

The Pixie needs an antenna, a power source, a headphone and a telegraphy key.

Ideally, the Pixie is best served by a proper shielded metal case, of course.