A:AnswerPankaj,
Models sold in the U.S. region support only the U.S. standard of 110-120v/60Hz. We recommend purchasing your product in the region it will be used to ensure compatibility with the power and broadcast standards of that region.
Thanks for your interest in Samsung products.
--Mr. S
A:AnswerMamaw,
If you set the TV to EXTERNAL audio settings, you can keep the volume down and adjust them using your headphones.
Thanks for your interest in Samsung products.
--Mr. S