The Dual Catch Bin attaches to the output bin on the top of the printer | This output option provides a second output destination of up to 250 sheets, expanding total output capacity to 500 sheets | Considerations- Cannot be used with any other finisher. Can only be enabled from the control panel configuration menu | Media support- Supports paper sizes as small as A6 and as large as 12 x 18 / SRA3 | Sensing- Does not detect if Dual Catch Bin is present or full | Location- The Dual Catch Bin attaches to the output bin on the top of the printer