Question about Livington Arctic Air

According to the product description, it needs 10W. This could be true, as it is only a small fan, not an air conditioner. The cooling comes from the little bit of water inside. Much more than 10W would also be difficult with Mini USB. For watt hours, simply multiply by the duty cycle in hours.

It says in the description: 12,000 BTU/h, which equates to 3.5kw.