First comment on the product:
"There is a need for a breakdown.
I have to see what is inside.
If the Li-Ion battery, it is a pure summer option.
It would be good if it had AAA or AA batteries and a battery compartment to remove them for the winter.
PS: I’m from Peter, where there’s 300 cloudy days a year and we don’t have such devices.

It seems to be a norm comment, all in the business, but the product is a DIMISESONY SHORTS! and :)