Ruchan, ( TA2AH ) The manual for the KSB2 SSB adaptor will provide you with the wiring data to use the MH-31 microphone with your K2. The 8 pin plug is compatible with the K2. I hope you enjoy your new K2, I am sure you will, it's an excellent transceiver. 73, Bob VE3XM K2 S/N 2676 K2/100 S/N 4031