Sigma ROX HR Transmitter and Strap<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>For ROX &amp; STS models with cadence</li><li>Digitally coded chest strap</li><li>EKG precise</li><li>Tool free battery change</li><li>Compatible BC1909，BC2209 and ROX computers Battery included #2232</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41jKKXHygnL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31agTUCi8gL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31InuGwFWfL.jpg" noproxy>