Garmin vivofit 3 Activity Tracker, Regular fit - White Auto-activity Detection - Capture Different Activities Automatically and View Them on Garmin Connect Online 1 Year Battery Life - No Recharging Needed. Shows steps, calories, distance, intensity minutes and time of day on backlit display; monitors sleep. Physical size - Regular: 135-205 mm circumference 24/7 Wearability - the Sleek Silicone Band Is Comfortable to Wear All Day on Land or in the Water GCM Compatible - Sync Automatically or Manually with Our Free Smartphone App to View and Analyze Your Stats Physical Dimension : Regular wrist circumference: 5.4-7.7 (137-195 mm); X-large wrist circumference: 6.5-8.9 (165-225 mm)