I use a magnetic phone holder and wanted to turn it on without having to use the power adapter to keep the tray open all the time. I connected this to "add circuit" (http://amzn.to/1YYPzts) and hidden it under the dashboard. Then I can charge my phone with a standard cable regardless of brand/model as long as it can be charged through a regular USB port. The 12V to 5V converter is built into the end of the plug, it's not very big and nicely built. Very happy with the results.
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