This is a new, unopened product. FX-AUDIO- Petit Tank DC Power Noise Cleaner & Bulk Capacitor - Extension Cable Type, Compatible with Output Plug Outer Diameter 5.5mm, Inner Diameter 2.1/2.5mm This is an accessory part in the form of a DC cable extension that connects between a power supply such as an AC adapter and a device. It reduces power supply noise and functions as a bulk capacitor, unlocking the potential of the connected device. Price: 1,850 yen @ Amazon