I chose this belt because very few support the Bluetooth 4.0, and are compatible android. Me and my colleague took the same. Just pair them away from each other, each with his phone (a Note 2 and Galaxy s4), and everything goes! We run together, and no problems pairing, and this for 3 months, 2 to 3 training sessions per week. We used it with runtastic but also works with other applications. Beware though, when an application is connected to the belt, other applications can not access it! Think in this case disconnect the unintended application with the belt, or restart the bluetooth. I recommend it to everyone!
