MK32 is the major model. Working frequency is 5 GHz, of which the long range performance is optimized by massive field tests, hardware turning, and software work. The MK32 link is compatible with HM30 and MK15.
MK32E is prepared for specific market in which only 2.4 GHz is allowed. The MK32E link is compatible with MK15E. The MK15E / MK32E link is not compatible with the MK15 / HM30 / MK32 link. The long range performance of MK15E / MK32E is no better than MK15 / HM30 / MK32.