Apple QuickTake 150 (for Windows) - Manual (Page 26)

Waking the camera
To conserve battery power, the camera goes to sleep after 60 seconds of
inactivity (or after 5 minutes of inactivity when connected to your computer).
To wake it, you can press and release the shutter, or close and reopen the
sliding lens cover.
If the camera is connected to your computer, you must close and reopen the
lens cover to wake it. Pressing the shutter won’t work.
To wake the camera, press
and release the shutter.
Or close and reopen the lens cover.
18 Chapter 2