belt driven tail rotor. so far every thing i read about it is pretty good i have seen so crazy vids of it flying including a guy that flys it upside down and lands it on the top rotor button. goto this page
http://www.helitown.com/X400.htm and scroll down to the vids section. what really sealed the deal today is the x400 is on the fron cover of one of the heli mags this months and great reviews inside.