may call for a review, and the result of the review will not affect the remaining challenges of either player. 

## 9. Final Decision 

The decision of the Electronic Review is final and cannot be appealed. In the situation where the written ruling (IN/OUT) on the video board differs from the graphic shown (ball mark digital imagery), then the ball mark imagery determines whether the ball is IN or OUT, not the written ruling, however, the Chair Umpire must contact the review official to get the final confirmation on the call. 

## 10. Review Official 

A certified official, approved by the Supervisor, shall act as the review official, whose duties shall include, but are not limited to: 

a. Determining which impact shall be reviewed by the system. 

b. Monitoring the system to ensure it is functioning properly. 

c. Notifying the Chair Umpire immediately in the case of a system failure or any other condition that prohibits or brings into question the ability of the system to review a challenged call. In this case, the Chair Umpire immediately shall notify both players that review is not available until further notice. 

d. Acting as the final authority on the number of challenges each player has remaining. Communicating with the Chair Umpire, at first possible opportunity, when one (1) challenge is left, and confirming the one (1) remaining challenge. 

The review official and supporting technology staff shall be located within the stadium or arena in a secured area and with an unobstructed view of the court. 

## 11. Video Board 

For each court that is using a review system, there shall be a minimum of one (1) video board, of sufficient size, located in a position where the Chair Umpire, players, and spectators may view the results of the challenge. 

## 12. Review Booth 

The following specifications are recommended for the electronic system review booth: 

