Very bright white LEDs on one side, amber LEDs on the other. In the center are two more groups of very bright white LEDs. Can recharge using USB cable, can also supply power via USB cable to device you wish to charge (like a mobile phone). Can also (eventually) recharge using built-in solar panel if left in direct or indirect sunlight (or bright artificial light). Hurricane season is here again, and hopefully we don't have a repeat of last year. But hope for the best and prepare for the worst, right?