Formal — to staff
Electronics · Store
You
すみません、この製品は海外の電圧でも使えますか？
すみません、このせいひんはかいがいのでんあつでもつかえますか？
Excuse me, can this product be used with overseas voltage?
Romaji: Sumimasen, kono seihin wa kaigai no den'atsu demo tsukaemasu ka? / Reply Romaji: Kochira no shōhin wa Nihon kokunai sen'yō desu node, kaigai de wa hen'atsuki ga hitsuyō desu.
Reply
こちらの商品は日本国内専用ですので、海外では変圧器が必要です。
こちらしょうひんはにほんこくないせんようですので、かいがいではへんあつきがひつようです。
This product is for domestic use in Japan only, so a voltage converter is required for use overseas.
Gesture & etiquette
Point at the product.
Always check the product specifications carefully, even if staff confirm. Voltage converters (変圧器, hen'atsuki) can be heavy and expensive, and not all devices work well with them. It's usually better to find a 'global model' if available.