Indoor Light System attaches to any ProChrono for use indoors. The Competition Electronics Indoor Lighting System is the perfect accessory for enhancing the performance of your ProChrono chronograph indoors. This system features a patented infra-red LED design, ensuring consistent and reliable readings. Easy to install, it includes a dual-voltage adapter and works with all ProChrono models. Designed for convenience, it also operates on a 24-volt DC power source and comes with a durable packing box for storage and transport.