Fitbit Flex - Manual (Page 7)

3
How to secure your wristband
1. Put on the wristband so the window of lights are closest to the outside of your
wrist and facing you.
2. Align both ends of the wristband so they are directly overlapping each other
with the clasp over the two holes that best fit your wrist.
3. Squeeze both the clasp and the wristband between your thumb and forefinger
until you hear a click.