Generation 2 and 2i players (excluding Pulse players) have an available IR IN port located on the back on the unit to allow an IR extender to be connected. This is useful with your player is not within line of sight of your listening area and you would like to use an IR remote to send commands to your player.
When connecting an IR Extender to your player, you will need to use the mono 3.5mm IR IN on the back of the player to do so. Since power is not provided from this mono 3.5mm port, you may also need to provide external power to your IR extender either from a wall outlet or the USB port of your connected player.