The Runtastic Heart Rate Combo Monitor is compatible with:
iPhone: 4s, 5, 5s, 5c, 6, 6 Plus, 7
Android: Bluetooth® Smart Ready devices running Android 4.3 or newer
Windows Phone: Bluetooth® Smart Ready Windows Phone running 8.1
The Runtastic Heart Rate Combo Monitor is compatible with:
iPhone: 4s, 5, 5s, 5c, 6, 6 Plus, 7
Android: Bluetooth® Smart Ready devices running Android 4.3 or newer
Windows Phone: Bluetooth® Smart Ready Windows Phone running 8.1