These little solar panels are great for charging one small electronic item at a time. Initially our panels would charge a bit quicker but over time they have slowed a bit. My husband and I each have one of these and both have had the same issues. If you plug more than one thing in at a time, both will charge but at a rate so slow that it is hardly worth getting them out for. We have also had issues with the panels not working at all unless they have full sun.
On the positive side, it will charge one small item (I haven't had any brand issues, it has worked with every brand I have used) such as a cell or one or ipod, rather quickly, in full sun. The last time I used it to charge my cell, it took about 6 hours to get a 90% charge.
With these panels you do have to be sure to keep them dust free and carefully stored. The panels are placed in a well made storage case that is waterproof so that is helpful but it doesn't stop them from getting bent.
These are okay for the price if your not going far and have a secondary power source to depend on.

Works well. Full price shown would be absurd. At $40-$50, the charger seems well worth it. In full sun it charges an iPad Air or two iPhones. if there are clouds, iPad charge indicator stops.

able to power my tablet and my cell phone

Good solar panel but dont know why comes with 2 usb conectors pluged 2 iphone in a sunny day and only 1 start charging

I give this product 1 star because the system would not allow me to give it 0 stars. It didn't work at all. I will return it but now I have to go through that hassle.