12 channel 24bit "Audiowire" expansion unit for the MOTU PCI424 card.
All in nice condition
The HD192 I/O is a two-space, rack mountable chassis with XLR audio connectors on its rear panel and level meters on the front. The rear panel has four banks of I/O in the following formats: ■ One bank of 12 XLR inputs ■ One bank of 12 XLR outputs ■ One pair of AES/EBU stereo digital I/O connectors
Here's the manual >MOTU<