The Tate Labs Barfly iPhone 5 allows your iPhone to be your training partner. This lets you have all your cycling and fitness apps exactly where you need them. It is compatible with the iPhone 5, 5s and 5c. This bundle includes an ANT+ to Bluetooth heart rate monator to send heart rate to your iPhone.The sturdy, double style clamp fits 31.8 handlebars that maintain the 31.8 diameter for at least 65mm and the stem needs to fit in the 45mm space in between the clamps - so this mount will work with the vast majority of bars and stems out there. The mount allows the phone to be used in the landscape or portrait position for the most desirable viewing. The iPhone 5 mount can even be oriented to take ride videos. The included case protects the lens during ride videos and has a headphone port.