Wahoo Fitness Blue HR: Bluetooth Heart Rate Strap A heart rate monitor built for Bluetooth Smart (4.0) including the iPhone 4S and newer, iPad (3rd and 4th generations), iPad Mini and select Android devices with Android operating system 4.3 or newer. Please consult the Wahoo website for full details on Android compatible devices Wahoo's proprietary Burn and Burst Heart Rate Training Plans make losing weight or getting faster easier than ever Works with the most popular running, cycling and fitness Apps such as Runmeter, RunKeeper, Cyclemeter, Strava, MapMyRun, Endomondo, Runtastic, Wahoo Fitness (included) and dozens more Tracks heart rate, time spent in each heart rate zone, max heart rate, average heart rate, and calories burned while you work out Replaceable coin cell battery lasts up to 12 months