Wolo (BA-107) Pro-Tec Heavy Duty Commercial Grade Back-Up Alarm 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