When it comes down to it if you don't have a quality radio your other equipment doesn't make much of a difference. This is where the JR SPORT Transmitters come into play. The S400 keeps things simple and affordable while still providing excellent signal quality. The 4-channel operation of the S400 makes it perfect for entry level Fixed Pitch Machines. Comes with a Trainer port many breakthrough features unheard of at this price before now. The JR TX can store profiles for up to ten different models and offers users adjustable exponential rates allowing pilots to fine tune and smooth out the responsiveness of their Heli. The large and easy to read display invites users to easily work with and program their radio. The radio is available with RS610UL Receiver and (2) SM15 Micro Servos or a standalone unit ( no servos and no receiver ). Both versions come with the NiMH battery pack and wall charger as well as a trainer body cable.