Product Description: I am a novice, so I have only confirmed that it powers on. This is a Universal Audio audio interface, the Apollo Twin (Solo Core). I am selling it to organize my equipment. [Condition] • Appearance: The main volume knob is missing. Please refer to the photos and purchase accordingly. • Included items: Only the main unit. *Power adapter, Thunderbolt cable, original box, etc. are not included. [Notes] Due to the missing knob and unconfirmed operation, this product is being sold as **junk (for repair or parts)**. The charger for this product is not the original, but it has been tested and works without any problems. Please inquire if you would like it. Instant purchase is OK.