When I was at my cousin’s flat last year, a gadget caught my attention. I recognized it from a magazine, I believe it was given a “design” award. This transistor radio has a transparent hard casing that gives the user a peek into the inner workings of the radio.
First source of energy is the small solar panel on the top side of the radio.
Second source of energy is a hand-wound spring. My cousin, Leanne says around 1 minute of winding gives you an hour of power. Very convenient for days out at the roofdeck for some sun.