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I've used the 510 since it first came out. But I recently bought the 515 because it has a
phone app that makes a loud tone when a car is detected. The head unit tone from the 510 is too quiet for me to hear when riding at speed. Not so with the 515 app. There's no missing that tone.
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Mark
markj.pics
"There is no shame in dropping fruit in your glass."
-UncleWede |