The latest generation President CB and 10 meter radios use a 6-pin connection instead of the standard 4-pin like many other radios. This is because most President radios come with the ability to change channels on the microphone, as well as being compatible with a wireless microphone. If you don't want either of these options and instead prefer to use a microphone of your choosing, this adapter will convert your radio from 6-pin to 4-pin, allowing you to use almost any mic you want. Make sure to check your radio's manual as some President radios require high impedance (1000 ohm) microphones, and others will work with with either 500 or 1000 ohm mics but require a setting to be changed.