This is a BOSS Enhancer. It's an old, discontinued model, so it shows signs of use. Power and sound output have been confirmed. The box and manual are not included; only the unit itself. Please purchase only if you fully understand that this is a used item. The Enhancer EH-2 is an effects pedal that achieves a wide variety of tones. - Model Name: Enhancer EH-2 - Input Jacks: 1/4 inch jack - Output Jacks: 1/4 inch jack - Adjustment Knobs: MIX, LOW, HIGH, MAX - AC Adapter Compatibility: DC 9V