Amazon Echo power transformer

Hi Guys,

Slightly off-topic but thought i’d ask the question.

I’m getting an Echo shipped over from the States to UK

Would i need a power convertor to down-volt to 120V?

Something like this perhaps?
http://www.amazon.co.uk/Stepdown-240-120v-Transformer-100VA/dp/B000NIYF0K

Anyone in the UK got any suggestions?

Thanks in advance

Just a standard adapter.

21W, 100-240V, 0.6A, 50/60Hz