Phono equalizer with vacuum tubes, volume/bass/treble adjustment functions, and a 3.5mm headphone jack. - Model: A1 Tube Preamp - Included: Cleaning cloth, AC adapter - Functions: Bass, treble, and volume adjustment knobs - Vacuum tubes: Equipped with 2 vacuum tubes ※ The area around the vacuum tubes and the main unit lights up with orange and green LEDs. → The switch allows you to switch between orange, green, and OFF. ※ Equipped with a phono/LINE output selection switch. ※ The included cleaning cloth is stained, so please consider it as a bonus. Thank you for viewing. Please check the condition and specifications of the product in the images before purchasing. It was working without any problems right before listing, but please understand that we cannot guarantee its operation. Please understand that this is a used item before purchasing.