The YAMAHA JX20 is a compact guitar amplifier with volume and equalizer adjustments. - Brand: YAMAHA - Model: JX20 - Input Type: HIGH/LOW - Volume Adjustment: Pull Gain Volume, Master Volume - Equalizer: Treble Adjustment - Features: Reverb, Headphone Jack, Power Switch Thank you for viewing. Please check the images for details regarding the condition of the item before considering a purchase. Due to the long storage period, the item is dusty, but it should be fine after cleaning upon arrival. The power turns on, and sound is produced. However, since I haven't actually used it as an amplifier, I'm not entirely sure. Regarding items that have not been tested for operation, new unused items, and unopened items, we cannot provide any guarantee if they do not work or are defective upon arrival. Thank you for your understanding. Please note that part of the cord is frayed. Please refrain from purchasing if you are a sensitive buyer, as this item is stored at home. Thank you.