Find out the specs of a component without manufacturer
2n2222 is all you need to know.  It is a standard kind of transistor made by many manufacturers.  (In fact it is the single most common kind of transistor.)  Go to one of the websites that does retail sales of electronic components (e.g., Jameco, Digikey, Mouser).  Type "2n2222" into the search box.  Click on the first transistor that comes up.  Somewhere on that page will be a link that is labeled "data sheet".  Click on it.  You will get a pdf file (from some random manufacter) that lists the specs.

Here is the one (from ON Semi) that I got when I did this at Digikey just now.