I was burned a few years ago by a cheap solar power bank. This is SO Much better. Completely charged my Iphone and Ipad simultaneously. Both to 100%. The recharge for the bank was taking a while on a rainy day so I plugged it in for a complete charge. After the next use (charged phone from 40% to 100) I left it in a window all day and it recharged almost to full,(4th light blinking) and topped off the next morning. ( Sun moves, windows don't) Excellent value, have 2 more for the wife and son and they are very satisfied. Only thing I'd change - Not sure I'd trust a compass mounted on a electrical device.