This is a used ZOOM RhythmTrak RT-123. The unit's condition is as shown in the photos, with scratches and dirt. The pads are yellowed. The back cover had rust, so a carbon fiber sheet and white cushioning material have been applied. The internal button battery has been replaced with a socket for easy replacement (see photos 10-11). The power supply is a third-party 9V 200mA adapter, compared to the original 9V 300mA, but it works without any issues (see photo 9). Operation has been confirmed as follows, with no problems: - Operation confirmed with AC adapter connected - DEMO function and rhythm function work without issue - No scratchy noise from OUTPUT when connected with a shielded cable - No malfunctions with knobs or switches ＜Included Items＞ - ZOOM RhythmTrak RT-123 unit - Third-party power adapter