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It was introduced in May 1994.<ref name="s327">{{cite web | title=VR-4 Manual | url=https://vrtifacts.com/wp-content/uploads/filebase/VR-4%20Manual.pdf | access-date=2024-05-21}}</ref><ref name="p926">{{cite web | title= VR4 User's Guide | url=https://web.archive.org/web/20190203183657if_/http://www.virtualresearch.com/Acrobat_files/VR_VR4man.pdf | access-date=2024-05-21}}</ref>
It was introduced in May 1994.<ref name="s327">{{cite web | title=VR-4 Manual | url=https://vrtifacts.com/wp-content/uploads/filebase/VR-4%20Manual.pdf | access-date=2024-05-21}}</ref><ref name="p926">{{cite web | title= VR4 User's Guide | url=https://web.archive.org/web/20190203183657if_/http://www.virtualresearch.com/Acrobat_files/VR_VR4man.pdf | access-date=2024-05-21}}</ref>
+==Specifications==
It weighs about one kilogram.<ref name="u717">{{cite web | title=Virtual Research Systems VR4 Head Mounted Display (HMD) | website=Wayback Machine | url=https://web.archive.org/web/19970329115912if_/http://www.virtualresearch.com/vr4.html | access-date=2024-05-21}}</ref>
It weighs about one kilogram.<ref name="u717">{{cite web | title=Virtual Research Systems VR4 Head Mounted Display (HMD) | website=Wayback Machine | url=https://web.archive.org/web/19970329115912if_/http://www.virtualresearch.com/vr4.html | access-date=2024-05-21}}</ref>