Arendo - heart rate belt / heart rate monitor (Heart Rate Monitor) | Chest | Transmitter with Bluetooth Smart 4.0 | waterproof | 14 grams | Black | Apple Products | with App i-gotU Sports on many Android devices (equipment)
Actually, I've got a pulse clock including belt. Since I have to jog every now and then but also take with music anyway iPhone case. And this belt works without an adapter - can be directly coupled with Bluetooth.