Turning the crank to bring your CDX Roller Coaster up to the top of the hill, or to watch the intricate play of movement as your Fun Fair Ride models spin, can be part of the fun. But sometimes you might want to just sit back and watch, put your CDX models on display, have several going at once. Or you are looking for some fun STEM learning about motors and gears. Whatever your reason for wanting your CDX Blocks model to operate hands free, our Motor and Battery Box is just the ticket. Built to align perfectly with our CDX gear system and comes with a compatible gear shaft. Just add 2 AA batteries (not included), connect it up, and watch your CDX Blocks creation come to life. Easily changes in and out so you can switch back and forth between hand crank and motor driven modes.