Here's how to install 
		VIVE Focus 3 Eye Tracker on the headset: 
	 
 
  
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Remove the face cushion from the headset. 
		  
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Turn the IPD dial all the way to the left to minimize the distance between the lenses. 
		  
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Squeeze the eye frames together and attach the tracker to the headset. 
		  
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Press firmly at the top of the tracker to lock it in place, then turn the IPD dial to make sure the headset lenses and eye frames move together. 
		  
- 
Remove the protective films from the eye frames. 
		  
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Reattach the face cushion to the headset. 
		  
- 
Connect the eye tracker to the headset using the 
			 USB Type-C® cable included in the box. 
		  
Connect the L-shaped end of the cable to the USB port on the right side of the headset and the other end to the eye tracker.