The purple stars designate the two solar power banks and one of the two included USB cords. The yellow star indicates a bedside lamp with USB charging slot, a handy modern upgrade. My phone and another device may be recharged by either of the power banks or the lamp's USB slot. Updated March 5, 2021, see the end of the article. With some people in Texas still without power after several days and accusations flying, it's a good reminder to consider the value of backup power systems even if it's just enough to keep your phone functioning. Fortunately, these little power banks are affordable and, if you're a fan of gadgets, you will notice them in technical articles or ads. If you're not the type to look at gadgets, then you can easily miss this gem of solar power convenience. In this article I'll compare two models I picked up from Newegg.com, an online electronics store with a good reputation. Since I don't see these everywhere, and the prices were ...