Waoo this is great @anamalogy, is the best Speaker I've seen so far. Here I will leave my comments of PROS and CONS.

Pros:

• E small and compact, also comes with features that make it unique in its kind.
• It helps the environment because its energy consumption is clean, since it is charged by a small solar panel.
• Its charge lasts up to 8 hours, perfect for use at night while it can not receive power.
• Also brings as an additional function to be a powerful PowerBank with which you can charge your mobile device.

Cons:

• Its price is somewhat high, I think it is more profitable to buy the typical rechargeable speakers.