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The USB end is a standard "A" connector, just plug it in to a USB socket on your PC and the other end into the Joystick.
Computer, phone will be ok. Ipad charger is highervpower/capacity and will probably be ok just charging it faster, up to you if you want to risk it. Do you have instructions or look up charging specs for the light
The one with the highest output.
The USB on my docking station can produce enough current to charge my phone in ~3 hours, the USB on the laptop is more like 5.........
The plug adaptor will trigger fast charge and do it in ~2.
Slot on a docking device, depending on what said devise was/ish should work. Is that what you charge you iPad through? If so, use it. if not, unplug iPad cable and plug that into the port you just unplugged.
Oh, the light will only pull the current it needs, so plugging it into a higher output USB port won't hurt it. Unless it's cheap and nasty and has no charge control circuitry/software.
I either plug it into my laptop or iPhone charger.
