Backup Alarm........
I had mine turned up from the default middle volume level to the highest level.
Also had the frequency change to emit the lower one ( closer to what my half-deaf ears could pick up)
When done,passengers say it was louder.I was still too deaf to pick it up.




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It has an audible alarm and also the visual warning lights in the back on the ceiling to let you know as you approach an object.
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