This solar charger is a great buy. I have not tried charging the unit via USB, but is charges up fine in the sun. I have used it to charge my phone, Ipod, and Bluetooth headset without any problems. It seems well constructed. I thought that the LED flashlight would be cheap but it actually seems well constructed and bright. I do wish they made a way of attaching this thing to a backpack for charging on the go. Other than that no complaints.