Purchased two years ago. Used once or twice a month until last year! You can use commercially available serums. Please use it for 10 minutes once or twice a week ( ¨̮⋆) [Contents] Main unit Original box Instruction manual Power adapter Authentic product with serial number Operation checked All modes are working properly. Level adjustment and LED lighting are also no problem! The exterior has no noticeable stains, and the electrode surface is also clean (ᴗᴗ ) I cleaned and stored it after each use. It has been thoroughly cleaned before listing, so you can use it as is with peace of mind! Even beginners on Mercari, Please feel free to ask questions. I will respond carefully. For those who understand that this is a used item, Thank you for your consideration(^^) Dr.Arrivo GHOST Miss Arrivo Ghost Miss Arrivo Dr.Arrivo