I just received it. First impression is good. It works and charges even with cloudy weather according to the LED indicator. Good build quality... It's hard to consider it waterproof, but it definitely has a good design for hanging on a backpack, for example. The mesh on the back side is very convenient for holding cables and devices securely.

2 years later, it continues to work flawlessly. With a suitable charger from a well-known company, it charges relatively slowly at 3A and 2A. It is more economical due to older technology but functional and decent.

It was purchased with the hope of charging in conditions of power outage. In tests conducted under direct morning and midday sunlight, it failed to charge the mobile battery above 80% after several hours (more than 5) (charging started from ~30%). If it couldn't reach 100% charging capacity under these conditions, then unfortunately it won't be able to do so in afternoon light or shade for a longer period of time. I am not satisfied and I rate it with 2 stars because it works only up to a certain point.