This is a battery-operated nail file! Operation confirmed, no instruction manual included. Purchased last month and used a few times, then stored at home. I am selling it because I couldn't get the hang of using it. The entire unit has been wiped with alcohol. As it is almost unused, I don't think there are any noticeable stains. New batteries have been inserted, but please let me know if you do not need them. How to use ① Batteries Insert 2 AA batteries. Make sure to insert them with the correct polarity (+ and -). ② Baby nail files (by age) Pink: 0-3 months Yellow: 4-10 months Blue: 12 months and up White: Finishing (for shine) *The metal and cylindrical ones are for adults. ③ How to use Attach the appropriate head for your baby. Turn on the switch. Gently touch the edge of the nail to file it. *Do not press in the center (as shown with an X in the instruction manual). ④ Tips If the nails are long, trim them a little before filing. It's easier to file after a bath when the nails are soft. ⑤ Precautions Do not use continuously for more than 10 minutes. Be careful not to let the baby swallow the batteries or parts.