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The Model FB523 classic wristband is made of a premium, comfortable silicone similar to that used in
many sport watches.
Wireless technology
Model FB523 contains a Bluetooth 4.0 radio receiver and NFC chip.
Haptic feedback
Model FB523 contains a vibration motor for alarms, goals, notifications, reminders, and tiles.
Battery
Model FB523 contains a rechargeable lithium-polymer battery.
Memory
Model FB523 stores your data, including daily stats, sleep information, and exercise history, for 7 days.
Sync your watch with the Fitbit app to access your historical data. Make sure the all-day sync option is
turned on.
Display
Model FB523 has a color AMOLED display.
Wristband size
Wristband sizes are shown below. Note that accessory wristbands sold separately may vary slightly.
Fits a wrist between 5.5 - 7.1 inches (140 mm - 180 mm) in circumference
Fits a wrist between 7.1 - 8.7 inches (180 mm - 220 mm) in circumference
Environmental conditions
14° to 113° F
(-10° to 45° C)
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