KASOTEK KK21 EVO KK 2.1.5 Upgrade Flight Controller Board With Larger LCD Second MPU,Support S.BUS Spektrum DSM2 DSMX DMSS KK2.1.5 Upgarde Version KK21 EVO muliti-rotor flight controller LCD,is an evolution of KK2.1.5 control board all the firmware of KK2.1.5 can run on this FC, but KK21EVO have larger LCD, a second MPU make KK21EVO support FUTABA S.BUS, SPEKTRUM DSM2, DSMX satellite,JR DMSS satellite direct connection There is the same main MCU(ATmega644PA) and hardware as KK2.1.5,user can flash all the KK2.1.5s firmware The second MPU use to convert S.BUS, DSM2, DSMX, DMSS protocol to PWM signal, user also can turn this MPU off so standard PWM receiver can be used Individual Package