Specifications: Age range: 0-18 Months Weight: 0.1 oz Dimensions: 5.25" x 2.1" App Compatibility: iPhone 5 or later (iOS 9 or later) What's Included: 3 fabric socks, sensor, base station

Smarter, More Reliable Sensor Owlet's updated sock sensor is flexible and designed to adapt to your baby?s foot as he or she grows. Updated pulse oximetry algorithms increase the precision and accuracy of your baby?s readings.

Redesigned Sock Designed for a better fit and placement, meaning more accurate readings. Hypoallergenic cotton gently wraps around your baby?s foot, and the sock can be worn on either foot, allowing parents to alternate as needed.

Better Bluetooth. Better Base Station. Improved Bluetooth range, up to a 10x increase (100 feet), between the Smart Sock 2 and Base Station.

More Data. Less Worry. Improved interface with sock sizing guide, push notifications and real time access to your baby?s heart rate and oxygen levels.