BOSS Tube Amp Expander with reactive load function, line out, and headphone output. - Brand: BOSS - Model: Tube Amp Expander - Features: Reactive load, line out, headphone output - Input Terminals: DC IN, Line Out, Speaker Out - Features: Air Feel level adjustment, speaker output minimum 4Ω Thank you for viewing. Used only a few times after being purchased new. A Bluetooth adapter (¥5,500) that can connect to your smartphone is also included. No operational problems, all accessories included. Will be shipped in the original box. Thank you for your consideration.