Bought to test the ability to charge directly from the sun while traveling to a cabin in New Mexico with no electricity or running water. I was skeptical at first, but when I opened the panel, connected the wires with the correct polarity (check this, it's easy to swap this part, this is your first time) and it worked like a charm. I was able to charge my LG G8 Thin Q, iPhone X and Anker PowerCore 20 Portable Charger 100mAh Super High Capacity Power Bank at 4.8A to full capacity. I started using the battery at night and just charged the battery with the device. in the sun during the day. Good: This solar panel USB adapter charge controller worked even better than I expected. This kept me and 3 other people without power for 3 days and fully charged only under sunlight. Worth every penny. It could be better: overall the construction is great, but not waterproof or durable (whatever) in that regard. since I had a very long cable and the charger was in the cabin) on the set of dual USB on the adapter dangled from the start. I saw a similar post so they should fix it. They lost the USB in the case, still worked great but they're weakened and the question is how long will these two last. Overall it's great and I'm happy.