Robotime - Marble Travel, London Marble Run Wooden 3D Puzzle TAM58700 AAA-size alkaline batteries x 4

AAA-size alkaline batteries x 4 for transmitter

Capacity: 8250mAh

But they think you will find uses for them all around the house

800 M8 units were-manufactured

Robotime - Marble Travel, London Marble Run Wooden 3D Puzzle TAM58700 AAA-size alkaline batteries x 4Prepare for a whirlwind tour of the British capital without ever leaving your room with this mechanical wonder disguised as a hands on 3D wooden puzzle. You get to go sightseeing with the help of precision engineering and some miniature versions of the Big Ben, the Tower Bridge, and the London Eye. Cross the Thames and board the double decker bus or the Tube and get to your destination in a jiffy, while metal spheres zip through ramps and tunnels