DX7S Transmitter with battery and charger - SECOND HANDDX7S Transmitter with battery and charger SECOND HAND MaNUAK INCLUDED Based on the DX8 platform, the DX7s has a 20 model memory, (helicopter or airplane) and is loaded with a number of valuable features not found in any other 7 channel in its class, making it the new radio of choice for 7 channel computer radio systems. Building on the successful Spektrum DX7 radio, the DX7s has improved ergonomics and a much more expansive and user friendly software