I bought the 3 pk. They work perfect. Came fully charged. I charged my cell phne and computer. Then I put it on the side of my car to charge by the sun. The magnets, they are strong enough to hold it there. I Love it. I have been looking for awhile to purchase one. Most were just the panel only no external battery, or big and bulky, orlow voltage, or just not what I wanted. This one was the perfect size , high enough voltage , external battery . But when I got it I was surprised it was alot better than I expected it to be. Very good quality. The case snaps very durable, well made, it looks better than any I've ever seen. I highly recommend this one above any other, the best price also. 100% satisfied. And believe me I check around every where before I purchase anything. These guy's stand behind everything you purchase from them
They are wonderful.