Slim, smart fitness tracker blends fashionable design with stylish metal accents and a bright, easy-to-read display. Includes advanced sleep monitoring with REM sleep and can gauge blood oxygen saturation levels during the night with the wrist-based Pulse Ox2 sensor. Fitness and health monitoring tools include wrist-based heart rate, all-day stress tracking, relaxation breathing timer, VO2 max, Body Battery energy monitor and more. Dedicated activity timers for walks, runs, strength training, yoga, pool swims and others; connects to your compatible smartphone's GPS for accurate tracking during outdoor walks and runs. Get vibration alerts for all notifications, including calls, text messages and more (text replies available for Android device users). Battery life keeps up with you; lasts up to 7 days (excluding Pulse Ox sleep tracking) and is safe for swimming and showering, too.