Crystal radios were powered by the radio waves themselves. Transistor radios came into existence after several decades. So in a way, H. Day was the owner of the coolest first walkman or personal radio.
The first walkman
About the author
Umair has a Bachelor’s Degree in Electronics and Telecommunication Engineering. He also holds a Post-Graduate Diploma in Embedded System Design from the Centre of Development of Advanced Computing (Pune, India). Currently, Umair is pursuing his MS in Electronics Engineering from the University of Hertfordshire (Hatfield, UK).