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XLR-4-31 is a type of electrical cable and connector. It is part of a family of cables and connectors known as “XLR,” which stands for Extremely Low Resistance. The connector is a 4-pin, male plug on one side with a 3-pin, female, in-line (or “L-shaped”) plug on the other. The 4-31 designation refers to the number of pins in the plug, the gender of the plugs, and the current maximum rating of the cable. This type of connector is commonly used in professional audio, video, and lighting applications.