I was scrolling through a few light sites and found this: http://www.lightscastle.com/product/wy6890-2.8v-4.5v-5ma-1000ma-drive-board-with-battery-board-530028 . It is not new, but a quick google search (WY6890) pulled up very little in terms of explaining what it actually does. So can any of you hazard a guess?
