Question: are oral b toothbrushes dual voltage?
Answer: Yes it is dual voltage. All you need is another Oral-B 240v charging base outside of the US, The Oral-B unit itself is dual voltage(made in Germany) it is only the US charging base that supports 110v. So if you are updating your Oral-B outside of the US, your current 240v base(model/type nu-3757) will work fine.