The ability to control the amount of {HEAD ~ ambient light} entering through {TAIL ~ a vehicle window} and window of a dwelling is particularly useful 
The ability to control the amount of { HEAD ~ ambient light } entering through { TAIL ~ a vehicle window } and window of a dwelling is particularly useful
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH