There are two DX7's. The early version has a 9.6 volt transmitter battery, and the later version has a 4.8 volt transmitter battery. I can't comment on the second generation. My first generation is a JR radio with a Spektrum case. I can't remember for sure, but I think it is a JR 9303 which was an excellent system. The second generation is an all Spektrum. Good luck.