The Week in iOS Accessories: Bluetooth, Bluetooth, Bluetooth
The $119 Tinké lets you track your heart rate, respiratory rate, blood oxygen and more using a sensor that then plugs into your iPhone for recording the data, which can then be shared via Facebook.
http://www.macworld.com/article/2031264/the-week-in-ios-accessories-bluetooth-bluetooth-bluetooth.html#tk.rss_all
