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 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 model. Stored at home, they are new and unused, but the bags have wrinkles. Since they are unopened, the functionality has not been confirmed. At home, expired ones were also used, but there were no particular problems. Since 4 pieces have already expired, if you wish, it is also possible to sell only the remaining 7 pieces. In that case, the price would be 3500 yen for the 7 pieces. If you wish to purchase the 7 pieces, please let me know in the comment section before purchasing, as I will need to make the change.