I will be traveling from the US to Europe. How can I safely charge my series 3 watch?
Can I safely charge my Apple Watch while traveling in Europe? What adaptors do I need?
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You only need a plug adapter to allow your current Apple power adapters (commonly called chargers) to fit the European sockets. One possibility is Apple World Travel Adapter Kit - Apple
or search online (e.g., Amazon) for European travel adapters.