Logitech 3D MOUSE & HEAD TRACKER Technical Reference Manual page 79

Head Tracker Transmitter
The Head Tracker Transmitter dimensions are shown in Figure A-2.
7 5/8"
Figure A-2. Head Tracker Transmitter Dimensions
Head Tracker Receiver
The Head Tracker Receiver dimensions are shown in Figure A-3.
2 3/4"
Figure A-3. Head Tracker Receiver Dimensions
3D Mouse & Head Tracker Specifications
2.0"
275 mm
10 5/8"
2 5/8"
67 mm
74 mm
2 7/8"
83 mm
3 1/4"
1 1/4"
7 5/8"
194 mm
1 5/8"
8 mm
3/8"
67