The product is a lot of 2 LEGO Mindstorms NXT Intelligent Bricks that have been tested and confirmed to power on. However, they have bad batteries. These bricks belong to the LEGO MINDSTORMS theme, specifically the Bricks Bricks Bricks set. Made of plastic, they are ideal for children interested in robots and programming. The brand is LEGO, and the subtheme is MINDSTORMS, offering endless possibilities for building and learning. I’ve used regular batteries in both and they start up but the battery packs they come with are no good. I do have the charger.