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OK I had the time to test out the distance. I broke out the laser tape measure and with the speakers within view of sight I ended up with 37' 10" (11.5316 m) with the lid shut. thanks for the question
sorry I have not been able to test that out yet, I've been working a lot of hours lately, but I am hoping to be able to test that out this coming weekend or early next week, I will reply with the answer as soon as posible,
It is for charging the unit but if you have something that has a cig adapter it's more of a input/ output port
Yes you can
yes it will charge if you are charging it and have the system operating
yes they are 'wired' inputs but I am not sure if they switch over
a rubber gasket or some silicon caulking behind the speakers would make it water resistant the speakers i used were marine speakers
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note I should have used some shielding on the wiring i get some feedback out of the speakers ever now and then
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I cant see why it would not work with a 20 - 30" touchscreen, the main thing is to make sure it is compatible with your raspberry pi this may help http://raspberrypi.stackexchange.com/questions/9339/larger-touch-screen-displays the biggest thing i can say is to do the research first, I went the path of one labeled for raspberry use and the largest i found was 10.1
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made it for my wife, i added a touch screen, speakers for audio alarm (because she was missing appointments, not checking a normal calendar) and a keypad if she prefered to use that for typing, i used a 10" touch screen because of space
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