HELP- Small Heart rate Monitor Transmitter

I have seen heart rate monitor transmitters that are a long elastic strap with a small (about 2-3 inch) transmitter.

Everywhere I look all I see are the long plastic transmitter straps that go across your whole chest. I understand that they are probably better able to locate a good heart beat, but because of the way I am built (please just trust me on this one) I chafe extremely badly where my bra strap meets the plastic HRM transmitter strap. I am hoping to have better luck with the smaller transmitter.

Can anyone tell me who makes them?

TIA,
 
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