Top highlights Operating System iOS, Android Special Feature sleep_monitor, pedometer, fitness_tracker Connectivity Technology Bluetooth Wireless Communication Standard Bluetooth Battery Cell Composition Lithium Ion GPS GPS Via Smartphone 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. Display size is 1.00 inches x 0.39 inches See less Product specifications User guide Waterproof Rating IPX7 Warranty Type Limited Connectivity Wireless Compability Bluetooth Connectivity Technology Bluetooth Wireless Provider du Additional details Closure Type Buckle Human-Interface Input Buttons Water Resistance Level Water Resistant Display Display Type segmented LCD Screen Size 25.5 Millimeters See all product information Product