This actually means that it is an extension of the trailer lighting cable. When the reversing alarm is on. The reversing alarm's tone is a bit shy; it's not as loud or "obnoxious" as the BU horn in my neighbor's van. To be at all visible, the spring-loaded dual cover must be slightly ajar, exposing the trailer's lighting connections to the elements. I opened the cap about half an inch which doubles or triples the sound of the BU horn, then wrapped heavy duty tape around the entire adapter leaving a 1 inch gap on the horn side to allow the sound to come out. If you have a trailer that is constantly connected to the network, this is a good solution. If you are more interested in BU signaling, there are more suitable and cheaper products.
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