LifeTrak Core 24-Hour Activity & Sleep Tracker w/ Reversible Band - Black/Volt New in box. Product details LifeTrak Core C210 Activity Monitor: Keep tabs on your heart rate, steps, sleep quality and more with this activity monitor that helps you achieve your fitness goals. The water-submersible design is safe down to 98.4' for durability and wide-ranging use. Fits most wrist sizes For a comfortable feel. Measures heart rate, calories burned, steps taken, distance traveled and workout To help you keep track of daily activity levels. Counts steps and calculates distance Utilizing a 50-60 step buffer to filter out false steps before updating the count to ensure you're actually walking. Pace-based algorithm adjusts to walking, jogging or running. SleepTrak Automatically detects sleeping and waking and tracks your sleep quality with motion, arm posture, ambient light and wrist-off detection. ECG-accurate heart rate Lets you check your fitness effort without the need for a chest strap. Water-resistant design Submersible down to 98.4', so you can wear the tracker while swimming. MeasurementsWatch Case Measurements: 53mm L x 29mm W Watch Case Thickness: 14mm Bracelet Measurements: 8-7/8" L x 28mm W Maximum Wrist Size: 8-1/2" Weight: 1.3 oz Will be shipped quickly and carefully. Please reach out with any questions. Great buy.