With LEGO MINDSTORMS Robot Inventor (51515), kids gain essential STEM skills as they build, code and play with remote-control model robots and intelligent creations that shoot missiles, play ball, drive around and more! With almost 1,000 pieces, including an intelligent Hub, 4 Medium Motors, Color Sensor and Distance Sensor with break-out interface, youngsters can also build their own fun robotic toys and share them online on LEGO Life An easy-to-install rechargeable battery is included, so no need to go hunting for spare batteries when the fun’s about to start Blast stands at over 14” (36cm) tall, while Gelo measures over 9” (24cm) long; The Powered Up components in this set are also compatible with the LEGO BOOST Creative Toolbox (17101), Droid Commander (75253) and others