tc electronic M100 reverb/multi-effect unit. It's compact and sounds great. There are a few scratches on the knobs, but otherwise, it's in clean condition. There are no operational issues. Please check the manufacturer's website for details. https://beetech-inc.com/products/m100/ M100 Stereo Multi-Effects Processor ◆ 24-bit processing / AD-DA conversion ◆ Equipped with 16 effects selected from the award-winning TC effects ◆ Versatile control functions for adjusting numerous parameters ◆ Stereo input control with LED level display ◆ Independent control of Mix level and output balance ◆ Effects can be turned ON / OFF with an external pedal Effects Included ◆ Cathedral ◆ Concert ◆ Club ◆ Camber ◆ Gold Plate ◆ Gated Reverb ◆ Reverse Reverb ◆ Ambience ◆ Delay ◆ Chorus ◆ Flanger ◆ Phaser ◆ Rotary ◆ Pitch Shift ◆ Delay + Reverb ◆ Chorus + Reverb