I love this 1950s advertisement for the "Motorola 6 Transistor Portable" radio set. Billed as a "big speaker" with "fine tone" and "long battery life (10 hours)", its virtually identical to ads today for bluetooth speakers. Interestingly this seems particularly marketed toward females: "fits your palm... or his pocket."
Not sure how much $24.95 is in equivalent cost today, but that sounds like an expensive gadget.
Here's another fun 1950s era Motorola commercial.