Mike, Yes, no problem. It needs bias. The MH4 was the replacement when the MH2 was no longer able to be sourced by Elecraft. 73, Don W3FPR On 1/26/2021 1:13 PM, NJMike wrote: > Will the MH2 hand mic that was originally for the K2 work with the K3? I > know there is an MH4 mic now that works with both rigs. >