I ordered this belt to replace my runtastic that dropped me without warning and for no apparent reason (after 8 months). So I turned to the Polar belt for use with the Runtastic application (Android Version) The belt is well made with a fairly convenient clip system to put and remove without the need to relax the elastic. The slightly bigger than the sensor runtastic is soon forgotten. The connection with the application is done instantly and after 2 outputs 10-11km I'm very happy. No inadvertent disconnection issue or any interruption measures. The product looks very reliable. To see if it lasts over time but at the moment no regrets that's exactly what I wanted.