Explanation of HX new type to old type

Hengxin has changed the types of all the induction heating machines, sample as bellow:

HX-40AB-MF

AB-->Separated type, machine is separated into a main machine (control part) and a head machine (transformer or capacitor box). If only A, it means integrated type.
MF-->Frequency, including UHF (Ultra High Frequency), HF (High Frequency), MF(Medium Frequency);