SONY SRF-201 FM Stereo Receiver - Credit Card Sized Radio 

This is a Credit Card Sized FM receiver - Walkman with rechargeable batteries. When placed into the charger, 3x AA batteries charge the internal batteries for you to enjoy this ultra thin Radio on the go. It is a marvel of miniaturization and yet another product from mid 80s (1985-1986). Sorry about the sound level, in order to capture the sound coming out of the headphones, I have boosted the microphone input. Since it is so small, a headphone jack was not possible to fit to this design.