Purchased around September 2023, but used less than 10 times. I don't connect this many microphones or guitars, and I've been using the 24-channel version, so I'm selling this one. Retail Price: ¥38,267 ￣￣￣￣￣￣￣￣ There is no instruction manual, but you should be able to find it online. Please use it after looking it up online. It's almost new. All the cords in the pictures are included. Roland Desktop computer, laptop Microsoft (R) Windows (R) 7, Windows (R) 8, Windows (R) 8.1, Windows (R) 10, etc. USB, Interface Number of channels: 4 16.5 depth x 31 width x 4.6 height (cm) ・ Up to 24bit/192kHz. 4in/4out ・ Equipped with 4 low-noise, high-quality microphone preamps ・ Equipped with Hi-Z input that supports high-impedance inputs such as guitars ・ Thorough low-noise design and robust metal body for clear sound quality ・ Equipped with highly visible level indicators and compressors/limiters to provide a reliable recording environment USB audio interface Compatible with Mac/Windows/iPad. Can be used for recording songs, DTM, recording, etc.