Steinberg USB audio interface CI1. - Operation confirmed - Some signs of use, but no problem with normal use - USB cable included - Box included This model supports Mac/Windows, but please check the compatible OS yourself as it is a relatively old model. How about it for home recording of guitar/bass, simple recording, or as a sub-unit/practice tool? Please refrain from purchasing if you are concerned about minor scratches or dirt as it is a used item. Instant purchase OK.