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The voltage of G2000 gaming speakers are 110-240V.
No, you don't. G2000 has volume memory and light memory, that is, if you turn off the speakers by pressing the shutdown button, the volume and light mode you preferred would not change the next time you turn on the speakers.
Yes. RGB lighting can be set according to different atmosphere demands. You can also switch off the lights if you don't need them.
The length of the cable that goes from speaker to speaker is 180cm/5.9FT and is not detachable.
The power plug is 130cm/4.26FT and is not detachable.