This is a new item, only tested after purchase. Sound output was confirmed to be working without issue. It's a compact bass amplifier for home practice. Features: Simple treble and bass equalization, with a shape switch for mid-range adjustment. Equipped with an external audio input and headphone output, making it ideal for practice. This is a 10W combo amplifier. Specifications: ■ Bass amplifier, combo type ■ Output: 10W ■ Speaker: 5" x 1 ■ Controls: Volume, Bass, Treble ■ Aux In, Headphone jack ■ Dimensions, Weight: 21.6W x 24.5H x 14.6cm, 2.6kg The power cord is a 3-pin type.