I was using this until recently. There are no operational issues. Due to the product's specifications, there may be some crackling. You can find this out by searching for reviews, but even when purchased new, the same crackling occurs. This is not a symptom of aging, but rather a characteristic of the product itself. It's a passive monitor controller, making it easy to adjust volume and select monitors. There are small scratches on the knob. It's convenient as you can switch to MUTE and MONO with a single button. The box is not included. Everything in the photos is included. - Model: BIG KNOB PASSIVE MONITOR CONTROLLER - Volume Adjustment: Adjustable with the large central knob - Functions: Equipped with MONO, MUTE, and DIM functions - Input/Output Terminals: BAL/UNBAL source input and monitor output - Connection Terminals: Line input (B) Thank you for viewing. DTM MACKIE Mixer Speakers Monitor Controller Interface