All 20 Premier League grounds are equipped with the technology which will allow decisions to be assessed from the VAR hub in Stockley Park, west London.
VAR will be used for 'clear and obvious errors' in four areas: - Goals, penalties, straight red cards and mistaken identity.
This will lead to changes in the viewing experience for fans:
Television: Viewers will be able to see what the video assistant referees watch, including an 'over the shoulder' angle of the officials in the studio. The VAR team will be announced in advance, as per the on-field refereeing group. Broadcasters will be keen matches do not extend too much over the regular 90 minutes, particularly Sky when it has double-headers, with matches kicking off at 14:00 and 16:00 BST.
Stadium: Information about a VAR check will appear on the big screens at the 18 grounds which are equipped with them ie 'Checking red card'. When a decision is overturned, a video of the incident will be shown when appropriate. At the two grounds which do not have screens - Anfield (Liverpool) and Old Trafford (Manchester United), announcements will be made via the scoreboard and PA.
https://www.bbc.co.uk/sport/football/49057675