MOOER's AB BAR effector with A/B loop switching function. - Model Name: AB BAR - Brand: MOOER - Power: DC 9V - Function: A/B loop switching - Switch: Mute switch - Input/Output Terminals: INPUT, SEND, RETURN, BYPASS Thank you for viewing. Please refrain from purchasing if you are concerned about the condition, as this is a used item. Thank you for your consideration.