The Wolo BA-107 produces a powerful beeping sound (107 decibel) when vehicle is in reverse to alert pedestrians and help prevent accidents. Designed with state-of-the-art electronics. Automatically adjusts to a voltage range of 12-48 volt DC. The black plastic case is water resistant and mounting is made easy with a heavy-duty zinc plated steel bracket. Includes mounting bracket, mounting hardware, warning decal and wire terminals. Instructions in English / Spanish.