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DIfferent bars for different people. Some folks want to control the lights, others (like you) just want on/off.
gps module is for auto switching between the 8 light modes. go fast it goes to spot. go slow it goes to flood etc...I find it weird that the "adapt" module includes a GPS antenna. Not sure why they would want to know where the truck is. I would think all they would need is a light sensor to know how much ambient lighting is available to switch the colors.