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