IC-2820 / Software and Cables
The blue USB-29A cable plugs into the outside speaker jack on the back of this radio. Page 9 in the owner's manual will refer to this as #10 external speaker jack. (Cable is used for programming only).

The orange USB-RTS05 plugs into the data port on the front of the radio body. (This cable can be used for both programming and data transfer on this radio).