Meet the zOrigin: a smart fitness tracker built using chip-stacking technology that can serve as a heart rate monitor, movement tracker, and temperature sensor. It comes with a 3D printed plastic enclosure, 25mAh rechargeable battery, and up to 2 weeks per charge.
zOrigin was built using zGlue technology. You can not only use it to track your activity but can also use your own product based on the chip that powers zOrigin. The device is Bluetooth enabled. Example apps are available for it, but you can always develop your own.[where to find it]