The External Display easily connects to the BatMaxx 5500 Speed Indicator with the 10 foot data cable included. The External Display duplicates the data shown on the display on the Speed Indicator PLUS it includes a bright red indicator light and audio signal that are activated during reaction time mode. The audio signal can be turned off if desired. The External Display can be mounted in front of a player on the optional External Display Tripod. It can also mount to a wall, fence, or held by the coach while working with players. Requires one 9 volt battery (not included).