The Sleep Monitor continually tracks your baby's heart rate and movement, suitable for every nap and bedtime. Not for sports. Soft & Adjustable Band. Gentle & breathable fabric provides a comfortable wearing experience like a sock. Two sizes of soft wraps for different age stages, with velcro to secure precisely. The free APP for IOS & Android allows you to monitor your baby's real-time heart rate and body movements during sleep and daily life. Review history records anytime and anywhere. Free PC Software. Export, print and share detailed PDF/CSV reports. Share with your families. Built-in Memory. Work stand-alone, even without a smartphone. Sync data automatically when connected to App. Rechargeable battery.