If it is being used for statistical purposes, it would be considered legal.
Per 12-2-8g:
ART. 8 . . . Unsporting conduct for a coach, substitute or team attendant includes, but is not limited to the following:...
g. Using electronic equipment, excluding computers (i.e., television monitoring/replay equipment, headsets, etc.), for coaching purposes during the set or any intermission; ...
If it is being used for coaching purposes, it is a card on the coach.
Hope that helps.