Versatile 2-in-1 Robot & Racing Car Building Kit: Explore endless possibilities with our 901-piece building blocks set that transforms into a dynamic tank robot or a speedy racing car. Unleash your child's creativity as they embark on an exciting journey of constructing their own RC robot or car using bricks, fostering curiosity and imaginative play. Dual Control Methods: Remote & App,Take command with two control options. Utilize the wireless remote control (requires 2 1.5V AAA batteries) for classic maneuvering or leverage the smartphone app via Bluetooth. The app boasts 4 engaging modes, including remote control, programming, path and gyroscope modes, with a remote control distance of approximately 20-30 meters.