The module includes {HEAD ~ two sensors} to generate {TAIL ~ movement data} indicative of movement direction and orientation changes of the device 
to generate
The module includes { HEAD ~ two sensors } to generate { TAIL ~ movement data } indicative of movement direction and orientation changes of the device
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH