WTEK - Heart Rate Monitor The HS-2BT is the new sensor WTEK compatible with all iPhone, smartphones, tablets and devices equipped with Bluetooth Smart Ready communication (iPhone 4S, 5, Galaxy S3, S4, One HTC, etc.). Like its predecessors, this sensor can be used with a normal sweatband wrist or head, thus allowing a workout in complete freedom, without uncomfortable chest belts. How does it work? The HS-2BT applies to a sweatband wrist or head and need not be dampened as the uncomfortable chest belt, does not absorb sweat and sterilizes in a second. See our demonstration video here: http://youtu.be/K08aLlrPCDA The sensor monitors the heartbeat in motion and transmits it to your smartphone or tablet. You can use it with the most famous App for sport as BeMyBeat , Runtastic ,  Runkeeper, Endomondo , Polar Beat , etc..