M11 can be bought with several packages :
- m11 full package consist TX + FM Module (At TX) + Receiver + 2 13 Kilos Sanwa ERG-VX
- M11 TX only, consist TX only (without module and else)
- M11 TX+RX consist all except two servos

Module at M8/M11 consist : AM, FM, Spektrum.

Make Sure you'll need M11 features before you buy it.
i play off road and lots of its feature i didn't use or even understood except Exp, EPA, ALB, Setup.
i choose M11 coz i like its style especially when you combine it with spektrum.

cheers