Used BOSS ME-30 multi-effects processor for guitar, with the original power adapter. As shown in the photos, there is some wear and tear, but the following functions have been confirmed to work with both the power adapter and batteries: * Effect switching via footswitch confirmed. * Effects are applied and sound is output confirmed. * Each switch is functioning confirmed. * Sound output from AUX IN confirmed. * Recording and playback functions confirmed. ＜Product Contents＞ * ME-30 unit * Original power adapter (OUTPUT: 9V 200mA) *Batteries are not included, please prepare them separately. Type...Electric Guitar Manufacturer...BOSS