Received it as a gift and used it only a couple of times. It's a great deal!

https://www.garmin.com/en-GB/p/605739
Slim, smart activity 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,3 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