Officially it was the SCR-578 emergency transmitter (there was no receiver). First made in 1942, these were in use through the 1980's in some countries.
They had a hand cranked generator for power and included an automatic SOS sender with an option to manually key Morse Code messages. These were inspired by a captured German survival radio. There were a few different ID numbers associated with these including BC-778-A , SCR-578, T-74/CRT-3 and AN/CRT-3. The transmitter itself was the BC-778, while the complete set including bag, radio, accessories was the SCR-578.
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