Bright 4" LED lights display score up to 199, time, bonus, possession, and period. Up/down timing to 99:59, with 1/10 second in last minute; workout/practice/circuit/injury recovery timer mode. Built-in horn and rear LED control panel for the scorer. Operates on 110V power or optional External Battery Pack. 22"W x 15"H x 8"D; 10 lb.