An effects unit with various reverb modes. - Model: RV-6 - Brand: BOSS - Output Terminals: OUTPUT A, OUTPUT B (MONO) - Input Terminals: INPUT A, INPUT B (MONO) - Function: Reverb effect - Included: Instruction manual, box, warranty card Thank you for viewing. It has been used a few times in live performances, so there is some wear and tear, but it works without any problems.