The miCoach family of devices were built specifically for use with the miCoach platform. Their use with the adidas Runtastic platform will be limited. See below for more details on your specific device:
Fit Smart: can be used with adidas Running as a heart rate monitor
Smart Run: this is a stand alone device and cannot be used with adidas Running
HRM Bluetooth: can be used with adidas Running as a heart rate monitor
SPEED_CELL Bluetooth: cannot be used with adidas Running
X_CELL: can be used with adidas Running as a heart rate monitor
MiCoach Pacer: cannot be used with adidas Running