Babytone Baby Pulse Oximeter Sock Tracking Oxygen Level Free APP 0-36 Newborn

【Comfortable sock with thre kinds of size】The unique-designed soft foot sock can be easily worn on the baby's foot, gentle and non-irritating. S/M/L size precisely suitable for babies weighted 0-8.6 lbs, 8.6-18.7 lbs, and 18.7-30.6 lbs.