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Back up alarms produce a loud beeping sound when the vehicle is put in reverse. They give a clear warning to bystanders behind vehicles. Three versatile sizes to choose from to be used for most all applications. Flush mount 4" round back alarms are rated at 97 decibels and fit in a 4" grommet. This round unit replaces one of your back up lamps and installs in minutes using the same back up light wiring. Other styles include a our small but commercial style 97 decibel unit that mounts on any horizontal or vertical flat surface. The largest unit we carry automatically self-adjusts its volume depending on the noise levels outside and can increase volume up to a loud 112 decibels. Easily mounts to any horizontal or vertical flat surface and only require a two wire installation.