Question about Polar H9 Size M-XXL

Had a Polar heart rate belt in combination with the corresponding Polar watch for 6 years, now definitely discontinued. This apparently no longer exists !!?? > The simplest Polar H9 is enough for me. But the big question, because no watch is included: Where can I read the results? As a jogger, I want to see it on my wrist, the pulse rate is enough for me. >> What do I need from the digitec programme? Thanks and best regards