This is a headphone amplifier that plugs directly into your guitar. It has 7 preset settings that you can switch between. I haven't used it much, and it has no noticeable scratches, but please refrain from purchasing if you are overly concerned about condition. [From the Aria website] - A headphone amplifier for electric guitars/basses that is easy to use by connecting it to your instrument and headphones. - It can connect to smartphones and tablets via Bluetooth, and the free app (Mighty Amp) allows you to control the amplifier, use 11 different drum patterns including a metronome, and play music from your device. - Numerous modeling amps and effects are available, as well as IR cabinet simulators and IR acoustic guitar simulators. - Uses NUX's proprietary TSAC (True Simulation of Analog Circuit) technology to reproduce realistic sound. - Can be connected to a computer via a USB cable and used as an audio interface. You can record your performance and monitor both the guitar and computer sound sources from the headphone jack. - Built-in rechargeable battery allows for approximately 3 hours of use on a full charge. Thank you. This is a sale of the unit only. I am currently using it, and there are no operational problems.