Masimo RD SET Neo These are adhesive sensors for pulse oximeters, specifically designed for newborns and adults. Suitable for patients weighing less than 3kg or more than 40kg, but the same type was used on a 5-year-old child weighing 18kg. Set of 11 Brand: Masimo Model: RD SET Neo Expiration Dates: June 1, 2025: 4 pieces February 1, 2026: 2 pieces June 1, 2027: 5 pieces These are left over because the pulse oximeter was changed to a different manufacturer's product. Stored at home, they are new and unused, but the bags have wrinkles. Since they are unopened, the operation has not been confirmed. At home, I have used expired ones, but there were no particular problems. Since 4 pieces have expired, if you wish, I can sell the remaining 7 pieces. In that case, I am considering selling them for 3500 yen. If you wish to purchase the 7 pieces, I will change the price, so please be sure to let me know in the comment section before purchasing.