Product details:

Move Bar - Motivates you to be active throughout the day by displaying a red move bar after one hour of inactivity. Additional segments light up for every 15 minutes of inactivity. Just walk for a couple of minutes to reset. 24/7 Wearable - Stylish, comfortable and water resistant wristband that is always on and ready to go. Long battery life - Stays on for more than a year without having to change the battery. Easy-to-read display - View the time of day and your stats right on your wrist. Achieve your goals - Vivofit learns your activity level and assigns a personalized goal each morning. Count calories - Records calories burned throughout the day including base metabolic rate. Monitor your sleep - Set the sleep mode when you go to bed to track the quality of your rest. Physical dimensions: 21 mm wide x 10.5 mm thick (length varies based on band size; 120-175mm (small wrist circumference) and 152-210mm (large wrist circumference)) Display size, WxH: 1.00 x 0.39 (25.5 mm x 10 mm)