I was given a little rechargeable desk fan, about 4" diameter, together with a USB charging cable but no USB mains plug. I have these plugs for my Kindle and mobile phone but do all such plugs have the same specification? I don't want to risk blowing a fuse or burning out the fan.
AFAIK you can't go wrong. We have a number of chargers with varying outputs, which we use on various devices, and have never had a problem. I'm guessing today's kit is self-regulating (most take negligible power if plugged in but with no device attached) so you shouldn't have an issue. In general, the different outputs only affect the charging times.