Armitron Men's 20/5078SET Digital Pro-Fit Interchangeable Black Silicone Strap and Silver-Tone Bracelet 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 bracelet, black silicone strap, rechargeable fitness module, usb charger and free mobile app Quartz Movement Case Diameter: 41.5mm Water Resistant To 99 Feet