[Elecraft] Questions on Yamaha CM-500 boom headset with K3

[Jon Zaimes AA1K]

Just bought one of these boom mic-headsets and plan to use with my K3's.

Is the battery bias supply included with the headset needed?

And do I need to adapt the microphone's 3-conductor mini phone plug to a
2-conductor before plugging into the K3 rear-panel mic input?

Thanks any help ....

73/Jon AA1K
www.aa1k.us