Used EBCM.  This is the electronic brake control module  (computer) for the ABS/Anti-Lock Brake system.  This came out of a manual transmission car with 3.07 gears, which means if you install this in an automatic and/or a different gear ratio manual, your ABS light will come on.  Fits the following:

86-88 Corvette w/ Manual Transmission

The item in the picture is the actual photo of the item being sold.