Colorado Time Systems Digital Pace Clock Basic (No Horn or Battery) Colorado Time 1151-PC-STANDARD 1151-PC-STANDARD Colorado Time Systems Pace Clocks have large 10 inch LED digits (red or amber) that can be adjusted for indoor or outdoor use. You can synchronize multiple clocks for use on deck.Basic Pace Clock. All of these units can be run as standalone pace clocks or set to run in a series of pace clocks with or without a timer or controller. Every pace clock in a series displays the same information.This is an AC unit only (110 VAC 60 Hz or 220 VAC 50 Hz). Basic unit includes handle, legs and two intensity settings. Does not include horn or battery.Digit Lighting Option: Choose Amber or Red.