The Smart Alarm® from ECCO was the worlds first self-adjusting back-up alarm, constantly measuring ambient noise and adjusting their sound level, creating a volume that is safe without being annoying or contributing to noise pollution. Smart Alarms® eliminate the need for constant manual adjustment and help prevent intentional alarm disconnection. Reverse mounted speaker enhances sound and protects the alarm from dust and moisture ingress. Grommet mount directs warning to the rear of the vehicle while reducing installation time, requiring no tools. Epoxy sealed against dust, moisture and vibration. For use with standard 4.5”rear lighting grommet (order seperately).