Topeak panocomputer17 function wireless cycle computer with speed and cadence dual sensor for real time ride information advanced bluetooth smart ble 40 super low energy usage transmits ride data between iphone 4s55s5c samsung galaxy s3s4 new htc one or other smart devices running the panobike app to capture ride stats or for sharing with your friends large single button is easy to operate even with gloves stores info from two separate bikes works with panobike app for calori