The DA-Port USB is an audio interface with LED indicators, featuring four optical interfaces and a headphone jack. It's a vintage audio USB-to-optical interface. I haven't been able to check the optical input/output, but it's automatically recognized by the PC, and the sound from the PC plays normally through the headphones. The headphone volume has a bit of crackling, but it's within a usable range. The included application cannot be installed on Win11 (because it's 32-bit). I haven't tried it, but it seems this unit can bypass SCMS. The included accessories are heavily discolored, but almost all of them are present. The original receipt shows a price of 23,940 yen (5% tax). - Brand: Canopus - Model Name: DA-Port USB - Connectivity: USB, Optical IN/OUT, Headphone - Sampling Frequency: 32kHz, 44.1kHz, 48kHz (both input and output) - Accessories: Manuals, etc., CD-ROM application, USB cable, Box Thank you for viewing.