Google Fitbit Air

KEY FEATURES Screenless Design: Tiny 5.2-gram tracking pebble with no digital display. Biometric Sensors: Tracks 24/7 heart rate, skin temperature, and blood oxygen. Sleep Tracking: Monitors sleep stages, detects naps, and features a vibrating alarm. 7-Day Battery: Lasts a full week and charges for a day in five minutes. Swimproof Build: Water-resistant up to 50 meters. Open-Source Hardware: Free CAD files available for 3D-printing custom bands. App Syncing: Connects via Bluetooth to the Google Health app. No Mandatory Subscription: Core health metrics are free to access forever.