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Memory
Model FB511 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 FB511 has a color AMOLED display.
Wristband size
Wristband sizes are shown below. Note that accessory wristbands sold separately may vary
slightly.
Small wristband
Fits a wrist between 5.5 - 7.1 inches (140 mm - 180 mm) in circumference
Large wristband Fits a wrist between 7.1 - 8.7 inches (180 mm - 220 mm) in circumference
Environmental conditions
Operating Temperature
Charging Temperature
Non-operating Temperature
Water Resistance
14° to 113° F
(-10° to 45° C)
14° to 95° F
(-10° to 35° C)
-4° to 14° F
(-20° to -10° C)
113° to 140°F
(45° to 60° C)
Water resistant up to 50 meters
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why do get X when i charge the watch