■ Dimensions: 0.89x.141 inch
■ Band sizes: Small, 5.5-7.1 inch, large, 7.1-8.7 inch
■ Sensors & Components: 3-axis accelerometer, Optical heart rate monitor, Altimeter, Vibration motor, Relative SpO2 sensor, NFC
■ Display: 1.57-inch touch-screen greyscale OLED
■ Memory: Saves seven days of detailed motion data minute by minute; saves daily totals for past 30 days
■ Water Resistance: To 50 meters.
■ Radio transceiver: Bluetooth 4.0
■ Battery: Lithium-polymer, two-hour charge time, up to seven days. Battery life and charge cycles vary with use, settings and other factors