Bluetooth straps only work on iPhone 4S and 5, iPad 3 , iPod touch 5th generation and newer.
SweetBeat, SweetBeatLife, Nature Beat, and Stress Detective are compatible with the following Bluetooth® enabled sensors:
SweetBeat also works with these popular health sensors:
SweetBeatLife. Nature Beat, and Stress Detective will not work with these sensors
Wahoo Fitness dongle or case with Garmin or ANT+ compatible heart rate monitor
60beat iphone dongle with Polar or other analog compatible heart rate monitor