This is the Arrow audio interface from Universal Audio. The current model is exactly the same in terms of specs and capabilities as the Apollo Solo. (It seems the model name was changed simply to be part of the Apollo series.) Therefore, for those considering purchasing an Apollo Solo and who don't mind a used item, the Arrow is a much better deal. The main differences from the Apollo Twin are the fewer output and input channels, one Unison preamp, one DSP (chip), and bus-powered operation. Recommended users include: * Beginners in DTM (Desktop Music Production). * Guitarists, keyboardists, and other musicians who record at home. (Those who don't need a lot of inputs and outputs, like a recording studio.) * For use on the go or on stage. In other words, I think that for the above users, models higher than the Apollo Twin are overkill. This item has only been used indoors in a non-smoking environment. As you can see from the photos, there are only minor scratches from normal use, and no noticeable damage or stains. Operation is good. This is a sale of the device only. Transfer procedures have been completed. The serial number used for product registration after purchase is written on the bottom of the unit. I will consider price reductions if possible. I am also listing this on other flea market sites, so I apologize if it sells on another site. Please refer to the official manual below for detailed specifications. [https://hookup.co.jp/assets/upload/support/attachments/2018/01/20226/UniversalAudio_Arrow_Manual_J_20180113.pdf](https://hookup.co.jp/assets/upload/support/attachments/2018/01/20226/UniversalAudio_Arrow_Manual_J_20180113.pdf)