User Manual

26
Fitbit Flex General Info & Specifications
Sensors and motors
Your Flex uses a MEMS 3-axis accelerometer that measures your motion patterns to
determine your calories burned, distance traveled, steps taken, and sleep quality.
Flex also contains a vibration motor, which allows it to vibrate when alarms go off.
Size and weight
Length
Width
Weight
Small wristband (incl. tracker)
5.5 – 6.9 in
140 – 176 mm
0.6 in
13.99 mm
13.4 grams
Large wristband (incl. tracker)
6.3 – 8.2 in
161 – 209 mm
0.6 in
13.99 mm
14.6 grams
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
Device is water resistant, and can be
submerged up to 10 meters.
Maximum Operating Altitude
30,000 feet
(9,144 m)
Help
Troubleshooting and assistance for your Fitbit Flex tracker can be found at
http://help.fitbit.com.