Garmin VivoSmart 4 retail activity and fitness tracker (md/lg)

Product Name: Garmin VivoSmart 4 retail activity and fitness tracker (md/lg)
About this Item Slim, smart activity tracker blends fashionable design with stylish metal accents and a bright, easy to read display.Physical size: Small: Fits wrists with a circumference of 122-188 mm. Large:Fits wrists with a circumference of 148-215 mm Includes advanced sleep monitoring with REM sleep and can gauge blood oxygen saturation levels during the night with the wrist based Pulse Ox sensor. (Not a medical device and not intended for use in the diagnosis or monitoring of any medical condition) Fitness and health monitoring tools include estimated wrist based heart rate, all retail day stress tracking, Relaxation breathing timer, Vo2 Max, body battery energy monitor and more Features dedicated activity timers for walks, runs, strength training, yoga, pool swims and others; Lens material: Polycarbonate. Strap material: Silicone. Compatible Devices VIRB Ultra 30 , VIRB XVIRB X and VIRB XEVIRB XE Get vibration alerts for All notifications, including calls, text messages and more.