The mixer works fine except for one problem. The power button is stuck inward. It permanently stays on unless, you take the plug out of power socket and it turns off.
You can easily fix this purchasing a spare part. The item "Pioneer DJM-500 Pro DJ Mixer" is in sale since Sunday, December 10, 2017.
This item is in the category "Musical Instruments & Gear\DJ Equipment\DJ Mixers". The seller is "stewabai-0" and is located in Goldsboro, North Carolina. This item can be shipped to United States.