What happens when you combine a remote-controlled tank and quadcopter drone into one? The B-Unstoppable of course. Not only can it handle just about any terrain, once the going gets really tough, just fly it over the impassable stuff. It can even turn 360° on the spot, and is equipped with an HD (1280 x 720) camera to capture all the action. Tread tension is maintained by arms that flex in and out by up to 4mm at either end as it goes over obstacles. The propellers sit flush with the treads when in “ground mode”.