Powertap PowerCal Bluetooth Smart and Ant+ Dual Band HR Powermeter<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Blue Tooth Smart and ANT+ compatible </span></li><li><span class="a-list-item"> Power meter calculated from heart rate </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31Ol07vjZ7L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41iXd0POdDL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51p62LvnXoL.jpg" noproxy>