The Ultimate Scoreboard Shot Clocks counts up or down from 1 to 99 seconds. Two 100' data control cables included. Eliminates the need to run control cable to each clock. 7.9" H LED numerals are visible within 300 feet. Extremely reliable and easy-to-use shot clocks powered by built-in, rechargable batteries or 110v AC power. Features four user-programmable wireless frequency settings.