Patented infra-red LED design eliminates light bulbs. Red LED “ON” indicator lights. Works with all Prochrono models. Dual voltage 100-240voltsAC,50-60Hz adapter included. | Will also operate on a 24voltDC source(ex. two 12volt batteries wired in series). Packing box is great for storage and transport. Individual replacement parts available. Made in USA with real service and support. |