Portable solar panel looks good when folded. I took the time to try it out. The sun is not very good. My 10,000 charging treasure was charged for almost three hours. I used a charging treasure and an outdoor small audio for the two ports. The charging treasure is full. I didn't know how much it was charged, but the audio didn't show. Anyway, it was still powered for two hours. The time did not allow the weather and the weather did not allow it. I tested these two. It is acceptable to charge a 10,000-dollar power bank in three hours. I hope in the future. Keeping it like this is satisfied, and it is very good to have this kind of efficiency. Anyway, it is also a spare and will rarely be used in the future, but in an emergency, I still choose the one with a small discount. For emergencies, it is better to be efficient and compact. Personal opinion depends on each person's usage.