How does ebay charge you if you're buying stuff in other currency?

i would like to buy comething from ebay (the monitor that logan just did(in considering, the 21:9 one), but it's in USD, and i only have GBP.
if i just pay, would they do a basic transferred? do the people get the GBP eqivalant? or do they charge you an extra heavy premium like most other companies out there?

Paying through paypal will automagically convert currency's for you.

There is usually no additional fee for the conversion, however you will be charged import tax which will be VAT values. This maybe charged at checkout, at customs on arrival in the country or if you are lucky not at all.