Info needed on an "ultimate game chair"?

i was recently given an "ultimate game chair" that didn't come with an AC adapter. I located on the company website where it says "* 2 - 2.5 A" but it doesn't say how many volts it requires. The site I found the info on is a href="http://www.ultimategamechair.com/faq.php" rel="nofollow"http://www.ultimategamechair.com/faq.php/a if I missed something, otherwise does anybody know what voltage I am looking for? Or if it matters, im not very familiar with amps and volts myself so please help?