The EX has everything that made the original RotoFly a success but this one is larger ( 350mm ) version. It comes ready to fly so the fun starts right away. Fly anywhere compactness. Realistic looks long flight times and both a training DVD and training gear. And along with it comes the gentle handling and comforting stability that make the RotoFly one of the easiest R/C helis to fly. The EX offers it all plus a light compact aluminum carrying case — and qualifies as the most affordable RotoFly ever offered. A great way to get started for newcomers and a great way to relax for the pros. Fully assembled and equipped. Lightweight lockable aluminum case provides solid protection and a great way to take advantage of grab-n-go flying opportunities. Heat sink on the tail motor and the main motor hold temperature in check for longer stronger performance. This cool package comes completely ready to fly out of the box and this combo ( Heli and transmitter ) ship to you in this beautiful aluminum travel case ( see picture below ).