Canon PowerShot SD770 IS DIGITAL ELPH User Manual page 13

Preparations
111
Attaching the Wrist Strap
Use the wrist strap when using the camera to prevent yourself from
accidentally dropping the camera.
Toggle
You can change its position on the strap. The
toggle can be used to open the terminal cover
and when inserting or removing memory cards.
To Open the Terminal Cover
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Hook your fingernail or the wrist strap toggle
under the bottom edge of the terminal cover
to open it.