I can't find a remote controller (I know there is another name for it) for mach4. Suggestions anyone

Hi,
I think you mean a 'pendant' sometimes also called an MPG.

I use a VistaCNC P1A pendant and have done so for six years.

There is one model of Chinese pendant (XHC) that is wireless....avoid like the plague!
In fact there is NO credible wireless pendant for Mach4.

Craig