This is a replacement I/O board (model 820-3455-A, also referenced as 923-0439) designed for MacBook Air 13-inch models. The board is compatible with A1466 units from Mid 2013, Early 2014, Early 2015, and Early 2017 generations. This component includes USB connectivity, audio functionality, and a DC power input connector.

Item seems to have been used. Not new. It is not tested.

The item is listed as being for parts, meaning it does not come with any warranty or guarantee of functionality. It is sold in its current condition without testing or verification of operation. This I/O board is a key internal component that handles connections between the MacBook's external ports and its main logic board, making it essential for USB device connectivity, headphone or speaker audio output, and power delivery through the DC inlet.

Buyers should have technical knowledge or access to repair documentation before attempting installation, as this requires disassembly of the MacBook and careful component handling. This part may be useful for repair technicians, hobbyists, or those looking to restore a MacBook Air with a faulty I/O board. Compatibility should be confirmed with your specific MacBook Air model before purchasing.