Umair Hussaini| Published November 10, 2016 | Updated September 20, 2017
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.
Umair has a Bachelor’s Degree in Electronics and Telecommunication Engineering. He is currently pursuing a PG-Diploma from the Centre for Development of Advanced Computing, India.