When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I use it to add a small speaker in the headrest for additional audio feedback.
I found it difficult to hear the V1 going 80+mph with the top down and the radio on (I have an all aftermarket stereo system). So I bought the remote audio add on and a small spearker from Radio Shack. I have the remote audio add on under the dash just to the left of the steering column and the speaker hidden in the webbing of the headrest.
I have one, and use it mostly on my motorcyle to drive helmet speakers.
In a car, it can be handy for two reasons:
1. increase volume of alert/relocate speaker for alert, and
2. Remote mute. I had it mounted on the side of the center console for a while, and it was nice to be able to shut-up the in town false alarms without reaching for the windsheild.