Price reduced! 4-channel stereo headphone amplifier with level adjustment knobs for each channel. - Brand: Behringer - Model: HA400 - Number of channels: 4 channels - Input type: Stereo input - Output type: Headphone output - Power: 12V DC Adapter not included. Operation has not been confirmed as I cannot find a 12V adapter. However, it was functioning without issue when I had the adapter. Therefore, please prepare a 12V adapter if you intend to use it. Also, please understand that this is a used, untested item and is being sold as junk, with no returns or refunds. Please purchase with the above in mind. Thank you for your understanding. Thank you for viewing.