Dream Sock® is the first-of-its-kind FDA-Cleared smart baby monitor to offer Live Health Readings and Health Notifications, for use with healthy infants between 1-18 months, 6-30 lbs. Track Baby’s pulse rate, oxygen, wakings, and sleep trends in real-time via the Owlet Dream App. View Baby’s historical health readings & trends in the app to gain valuable insights. Clinically-proven to offer medical-grade accuracy, even through gentle motion, across all skin tones. EUC.. You will need to download the Owlet App. The sock is removable/washable. Would recommend washing before use.