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Memory
Charge 4 stores your data, including daily stats, sleep information, and exercise
history, for 7 days. Sync your tracker with the Fitbit app to access your historical
data.
Display
Charge 4 has a PMOLED display.
Band size
Band sizes are shown below. Note that accessory bands sold separately may vary
slightly.
Small band Fits a wrist between 5.5 - 7.1 inches (140 mm - 180 mm)in circumference
Large band Fits a wrist between 7.1 - 8.7 inches (180 mm - 220 mm)in circumference
Environmental conditions
Operating temperature 14° to 104° F
(-10° to 40° C)
Non-operating temperature -4° to 14° F
(-20° to -10° C)
104° to 140°F
(40° to 60° C)
Storage temperature for 6 months -4° to 95° F
(-20° to 35° C)
Water resistance Water resistant up to 50 meters
Maximum operating altitude 28,000 feet
(8,534 m)
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