BNF or Bind-N-Fly remote control airplanes. These models come factory-assembled with the motor, ESC, servos, and a Spektrum 2.4GHz receiver already installed. BNF kits are the perfect choice for pilots who already own a compatible Spektrum transmitter, flight batteries, and a charger. Since the package does not include a radio, battery, or charger, it saves you money and allows you to use your preferred equipment. Always check the exact requirements in the individual product description!