Fitbit Zip Charge HR - Size; Environmental conditions

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Size
Small wristband
Fits a wrist between 5.5 and 6.7 inches in
circumference
Large wristband
Fits a wrist between 6.3 and 7.6 inches in
circumference
Extra large wristband
Fits a wrist between 7.6 and 9.1 inches in
circumference
Environmental conditions
Operating Temperature
-4° to 113° F
(-20° to 45° C)
Non-operating Temperature
-22° to 140° F
(-30° to 60° C)
Water Resistant
Splash proof. Do not shower or swim with the
device.
Maximum Operating Altitude
30,000 feet
(9,144 m)
Help
Troubleshooting and assistance for your Fitbit Charge HR can be found at
http://help.fitbit.com.
Return policy and warranty
Warranty information and the fitbit.com Store Return Policy can be found online at
http://www.fitbit.com/returns.