Amazon.com: Owlet Dream Sock - Smart Baby Monitor - Foot Sensor to Track Heartbeat and Oxygen O2 Levels in Infants and Babies - Notifications for Night Wakings, Movement and Sleep State -
Owlet Dream Sock Plus - Smart Baby Monitor with Heart Rate and Average Oxygen O2 as Sleep Quality Indicators - Standard Sock and Plus-Sized Sock to Grow with Baby, Mint : Amazon.ca: