Nothing! Everything you need to get in the air is included in the box, including four AA batteries for the transmitter.
The amazing Blade® Scout CX heli may only weigh a little over half an ounce (17 grams), but it will have you flying circles around other helis like it. State-of-the-art 2.4GHz radio control with advanced Blade engineering and electronics** make it all possible. And it s so easy to fly, you ll be able to do it even if you ve never flown before.
** The included radio system is not compatible with JR 2.4GHz or Spektrum 2.4GHz systems.