The Wolo BA-97 is designed for heavy-duty use. Automatically adjusts to a voltage range of 12-24 volt vehicles. The state-of-the-art electronics are sealed in rock hard epoxy for all weather usage. The black plastic case is waterproof and has strong mounting brackets. Produces a powerful beeping sound that is 97 decibels, to help warn when the vehicle is backing-up. Easily installs to any one or two wire systems. Includes mounting hardware and warning decal. Instructions in English / Spanish.