BOSS AC-3 effector with acoustic simulation function. It has been used, but it still works. As shown in the 6th image, I have confirmed its operation. It produces sound without any problems. It was returned previously because it was not working, but I have checked it many times and it powers on and operates without issue. - Model: AC-3 - Brand: BOSS - Function: Acoustic Simulator - Connection Terminals: G.AMP OUT, INPUT, LINE OUT - Adjustment Knobs: Reverb Level, Body, Top, Mode - Accessories: Box, Instruction Manual Thank you for viewing.