This is Controller/PCB (Printed Circuit Board) for 3.5" 

Western Digital My Book HDD.

Converts 3.5" SATA HDD into USB 3.0 interface.

This board is used, tested and in great working condition. 

PART NUMBER
4060-705149-000 Rev. A - Printed on the board

4061-775213-100 REV. AA 5 - on the barcode sticker

Will support up to 8TB Western Digital HDD

Actual item's photos are provided.

I-319