How to tell which version of Squeezebox I bought?

I need a little help in identifying which version of the Logitech Squeezebox I just purchased from another website.
it has M/N C-RH62 on the label. How do I tell if I have Squeezebox classic, Squeezebox 2, or Squeezebox 3? Thanks for any help you can provide. I want to upgrade the power supply and need to select the correct one for this model.