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This product has 72 LEDs that emit an invisible infra-red light to ensure optimal contrast in optical sensors and reliable indoor chronograph operation. This eliminates invalid readings that can occur when using incandescent or fluorescent light sources with varying intensities and coverage. It is portable and easy to set up; simply mount the light arcs and connect power. A red "ON" indicator illuminates when in use. A 120 VAC adapter is included, but it can also operate on a 24 VDC source (two 12-volt batteries wired in series). The shipping box safeguards the unit during transport and storage. This product comes with complete instructions and is compatible with all ProChrono model chronographs.