This is interesting because it hase a reasonable range (33′ being class 2 Bluetooth) and it has charging and is integrated with the iPhone and may be hackable for other applications – could be of use for rehab and distraction applications in hospitals.
Scosche myTREK wirelessly connects to iPod touch or iPhone
No bulky chest straps or wires!
Audio prompts for real-time feedback while you work out
Control music from the armband while you work out
Lithium-ion battery provides up to 5 hours of workout time
Includes USB charging cable
Work out from up to 33 ft away from your device
Scosche myTREK App manages pulse, training type, calories burned, distance run, music and more*