You want the  first one.

The one that has the "M" on the end is for a modular  jack, it won't fit 
  the round jack on the 2000.

73, Steve KW3A

On 8/24/2014 5:41 PM, Richard B McDonald wrote:
> Hi!
>
>
>
> There are two different Heal adapters; either of  which looks like it will
> connect the Yamaha CM500 headset
> <http://www.amazon.com/Yamaha-CM500-Headset-Built-Microphone/dp/B000BZ6ZX0/r
> ef=sr_1_1?ie=UTF8&qid=1408725338&sr=8-1&keywords=Yamaha+CM500>  to the
> Kenwood TS-2000.  Below are links to each of the two different models.  I
> want to use a foot switch with whichever Heal adapter I get.  However, I am
> not sure which adapter is the right, or best, one.  What is the difference
> between the two models, anyway?  Can anyone advise me on this?
>
>
>
> Heal AD-1-K: https://www.hamcity.com/store/pc/AD-1-K-p450.htm
>
>
>
> Heal AD-1-KM: https://www.hamcity.com/store/pc/AD-1-KM-p452.htm
>
>
>
> Thanks & 73,
>
> Richard KK6MRH
>
>
>