I bought this cardio to try to connect with my Galaxy S4, with the hope to make the app work with the Samsung Bad pick. Not compatible. So, I went on the site and Playstore RunAlyzer to try to find compatible android apps. Finally, there is very little. Probably the world's IOS it more profitable. Apart from that, it works well: recognized very quickly, the measure has the reliable air. It is portable for a substantial period. So rather good product in itself ... but too limited compatibility Android