The primary function is to offer directions using the GPS. The LEDs tell you which way to head with simple green arrow animations and alert you to upcoming turns by flashing a red exclamation point.
He was draining 3-pointers in traffic and at one point, he scored 12 straight Nets points in the third quarter, all the while running around the court in jubilation and flashing the "3-point" symbol with his hands.
With around four years to go at that point, it is doubtful that red warning signals were flashing over the 2014 hosts Brazil. (Some may argue that with the test event of a Confederations Cup in 2013 the organizers had less time).