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Hi Julie, Thank you for your inquiry! We are unable to find any information on the KLT700 speaker. If you're referring to Sony SRSXP700, Here are the power specifications for this model. AC 120 V, 60 Hz (US, CND, PX). You can directly plug in the AC power cord (mains lead) to the wall outlet if you're taking this speaker to Vietnam. Hope this helps! -Sam
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