I have been researching this radio alot (atv25b). I am about to get one also. You can get a bluetooth accessory for a little more. They are pretty cheap on amazon. Keep in mind that they always draw power from your battery though. You either need to unplug from your 12v when not in use or put a toggle switch.
You can buy a cheap relay that will only engage when ignition is on.
I installed one on my Viking to control ALL after market electric toys.
It mounts easy in battery compartment and looks just like the factory relays.
They will control up to 40 amps. (the one I used)
This will save you if you forget to turn you toys off.
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