Purchased new on Amazon for ¥12,980 on 2025/12/21. This item is being sold unused because it is not compatible with the model I own. The box is slightly crushed, but the item is unused. Electrode unit FKA4100014 Replacement guideline: Approximately 3 years (when operating 12 hours a day) Compatible main unit products for this consumable/accessory * "-K" and "-W" at the end of the product number are color/pattern codes. F-MV2100-WZ/F-MC1000V-W/F-MV1000-W/F-MVB15-WZ/ F-MV1100-W/F-MVB10-W/F-JX1100V-W/F-MV1500-WZ/F-MVB11-W/F-MVB21-WZ/