[ace]

pricing isnt bad.

PTS 400 - $2,845.00 is 4 belt packs. 5 is a little more. Doesnt listthe price for 3 belt packs but I imagine it's less than 4. 90 dollars for a case, 75 for set up to a clock and shipping.

the software the NBA uses is i'm sure customized and plugs into the back of the unit.

From the price/product sheet I have:
RECEIVER BASE STATION - Designed to interface only with the belt packs coded to the particular school/arena. Base Station unit is equipped with start & stop buttons and (5) five Low-Battery Led indicator Lights.

TRANSMITTER BELT PACKS - worn by the on-court officials that allows them to start and stop the game clock. PTS Series 400 and 500 allow you to have additional belt packs as a back up in case there is a malfunction.