This is what they came with.
http://cgi.ebay.com/Mesa-Engineering-Rectifier-Channel-Footswitch_W0QQitemZ270174913017QQihZ017QQcategoryZ43374QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
or
http://cgi.ebay.com/Mesa-Boogie-Dual-Rectifier-Footswitch_W0QQitemZ170156636018QQihZ007QQcategoryZ43374QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I have three of these and I used them for channel switching, tremolo and effects loop. It will also toggle the reverb but I never really wanted that function. I currently use one to switch between Simul-Class and Class A on my Mark IV.