HRM-Run compatibility question.

Hello

I own a Forerunner 245 and a HRM-Run that work together seamlessly.


My father after a myocardial infarction needs heart monitoring during activity, so I'm borrowing him the watch and the strap for the time needed.

My question is: 

Can he use my HRM-Run, if he buy a simpler watch like Forerunner 35 or 45?

Of course he doesn't need running dynamics like me, only accurate heart monitoring during activity.

Is compatible over ANT?

Thank you