Portable analog mixer equipped with a variety of input/output terminals. Supports 24-bit/96kHz digital output. Operates on both AC adapter and battery power. The headphone volume knob has some scratchiness, but it clears up with a little adjustment. The exterior shows some signs of use. Used only indoors with AC power; the battery compartment terminals are not degraded. Includes only the unit and AC adapter as shown in the photos; the manual is available on the manufacturer's website. The following is transcribed from the manufacturer's website: Channels: 10 input / 2 output Connectors: Inputs 1-6 = 1/4" phone Inputs 1-2 = Stereo mini (plug-in power) Inputs 5-10 = RCA Main Outputs (L, R) = TRS 1/4" phone (impedance balanced) / RCA Digital Output Connector = Optical / Coaxial Headphone Jack (L, R) = Stereo mini Power: DC 9V (AC adapter), AA batteries x 4 AD Conversion Sampling Frequency: 44.1/48/96kHz Signal Processing: 24-bit Dimensions / Weight: Width: 181.2 mm Depth: 107.5 mm Height: 54.0 mm Weight: 0.393 kg Thank you.