It's a six drum-wheeled all-terrain solar vehicle, equipped with mechanical suspension and a 4x4 drive system. Your Solar Rover conquers terrain and crosses boundaries with ease. The fantastic planetary gears transmission system and adjustable robotic arms to add more excitement and fun for Rover operators to play and learn. Just assemble, find some sun and let your Rover rove.NO BATTERIES REQUIRED. Just take your time, follow the clearly illustrated instructions, and get to work.