Millions of parents around the world trust Owlet every night to help them keep their babies safe while they sleep.THe award-winning Smart Sock goes beyond the capabilities of any other baby monitor to tell you the things that really matter, when it really matters. Features: Track heart rate and oxygen with proven pulse oximetry technology Measures sleep trends - view total hours slept, number of wakings, sleep quality and more Fits baby's 0-18 months - fabric sock fits 5lbs - 30 lbs, for both left and right feet 16-hour battery - get 8 hours in 20 mins and a full charge in 90 mins Wireless charging via a convenient drop-and-go on the Base Station The Smart Sock comfortably wraps around the baby's foot and connects to a base station up to 30m away Tells you when Baby needs you. Base Station and Owlet app notify you when readings leave ‘safe’ zones What's in the Box:Smart Sock SensorFabric Socks, 2 left & 2 rightBase StationCharging CordsPower Adaptor Specifications: Dimensions