This is a beautiful item with little use. I have confirmed that all functions are working correctly. Retail price: 42,800 yen Thank you. ＜Features＞ ■ This is a professional headphone amplifier equipped with 6 independent channels. ■ Each channel has one headphone output each for the rear and front, and an AUX input on the rear. They are in parallel, so they can be used simultaneously. ■ Each channel is equipped with EQ (BASS, TREBLE), allowing for individual channel adjustment. ■ The MONO select button on the front panel allows you to select Stereo, Mono L, Mono R, and Mono Sum. ■ Equipped with a thru-out output, making it easy to connect multiple units. ＜Specifications＞ ■ Maximum Input Level: +21.5dBu ■ Input Impedance: 40KΩ (Balanced) ■ Maximum Output Level: 500mW @32Ω ■ Maximum Gain: 25.6 dB (Tone Controls Set Flat) ■ Frequency Response: 20～50,000Hz (+0, -2dB) ■ CMMR (Common-Mode Rejection Ratio): 40dB ■ Dimensions: 44.5 x 482 x 190 (mm) ■ Weight: 3.1 kg