Canon eos rebel t1i - Manual (Page 130)

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You can prevent the beeper from sounding when focus is achieved or
during self-timer operation.
Under the [1] tab, select [Beep], then
press <0>. Select [Off], then press
<0>.
This prevents shooting if there is no card in the camera.
Under the [1] tab, select [Release
shutter without card], then press <0>.
Select [Disable], then press <0>.
If there is no card installed and you press
the shutter button, “Card” will be
displayed in the viewfinder, and you
cannot release the shutter.
You can set how long the image is displayed on the LCD monitor
immediately after capture. If [Off] is set, the image will not be displayed
immediately after image capture. If [Hold] is set, the image review will
be displayed up until the [Auto power off] time. During the image
review, if you operate any camera controls such as pressing the shutter
button halfway, the image display will end.
Under the [1] tab, select [Review
time], then press <0>. Set the time,
then press <0>.
Handy Features
3 Silencing the Beeper
3 Card Reminder
3 Setting the Image Review Time