Armitron Women's 75/5316SET Digital Pro-Fit Interchangeable Black Silicone Strap and Silver-Tone Bangle Watch Set Digital fitness Tracker module features time, day/date, step counter, distance traveled, calorie counter and sleep monitor Interchangeable set includes: silver-tone adjustable link bangle, black silicone strap with silver-tone bezel, rechargeable fitness module, usb charger and free mobile app Quartz Movement Case Diameter: 36.5mm Water Resistant To 99 Feet