Used BOSS GT-8 guitar effects processor with an aftermarket adapter. Functionality has been confirmed as follows, with no issues: * Audio output with effects functions: no problems * No crackling sounds when connecting cables to INPUT and OUTPUT jacks * Switches, knobs, and footswitches: no problems * Screen display: no problems The unit has scratches and rust as shown in the photos. The power adapter is a third-party AC 12V 1A 12VA adapter, but it works without any issues. ＜Included Items＞ * BOSS GT-8 unit * Aftermarket power adapter