Polar Heart Rate Monitor. Cycle & Run?

I believe Polar has a store - yes you can use one heart rate monitor belt for both - that is what I do

in fact, you can even wear your polar HR strap to the gym and the HR will appear right there on the screen of the treadmill/bike.  Although something to note...a few months ago I noticed the two machines closest to me the very slow patrons both had my exact HR without touching the bars...so I think it can kind of bleed over.  Although I am sure the lady felt great seeing she burned like 1000 cals