This wearable baby sock is engineered to monitor heart rate and oxygen levels, providing essential health insights. It connects seamlessly to mobile devices, allowing for real-time data tracking. Finally, you can rest assured! The design is unobtrusive, making it a perfect for your sleeping baby. It comes with the entire set plus 3 brand new blue socks for ages newborn to 18 months. Invest in your baby’s health and your peace of mind.