This is a stereo headphone amplifier and preamplifier. ☆Operation Confirmed☆ This is a self-made amplifier using a CQ Publishing board. It's a headphone amplifier, but it can also be used as a high-quality preamplifier. It's also ideal as a preamplifier for tube amplifiers, Class D amplifiers, etc. ☆RCA conversion cables are included, so please connect from the front side (headphone jack) to the amplifier. 【Condition】 ◎ There are paint scratches on the front panel. ◎ The DC adapter input is not connected, so please use it with AC100V. ◎ There is a pop noise when turning the power ON/OFF. Also, although it is not microphonic, noise will occur if it is subjected to impact. Included: RCA conversion cable, power cord Dimensions: Width 25cm Height 5cm (excluding rubber feet) Depth 17cm (excluding protrusions) Please check the appearance in the photos. Please consider this opportunity.