This product has mixed reviews. Some people love the Opteka BP-SC6000, some don't. It is basically a 6000mAh backup battery for charging your gadgets (smartphone, tablet, camera, etc,). The neat twist is the addition of a solar panel to help top off the battery if you don't have a wall outlet handy. The real reason the BP-SC6000 made it up on the GadgetKing website is the huge price drop from $119.00 to just $24.95.