It looks useful; but I wonder, who would leave their phone to charge in full sunshine? (as in the first image of your hunt) hahaha.
It's always a good idea to have some kind of powerbank with you these days and this one has a good price so it's easy to acquire.
I think that picture was just taken for aesthetics :DD. My bad, that picture might be misleading but I think this is a cool innovative approach in utilizing the sun for power and understanding the science behind it!
Thanks for the comment