Canon EOS REBEL T3 Basic Instruction Manual page 232

3 Menu Function Settings
Sound recording
When the sound recording is set to [On], sound will be recorded by
the built-in monaural microphone. The sound recording level will be
adjusted automatically. An external microphone cannot be used.
Metering timer
You can change how long the exposure setting is displayed (AE lock
time).
Grid display
With [Grid 1l] or [Grid 2m], you can display grid lines. It can
help you level the camera vertically or horizontally.
The sound will be recorded at a 48 kHz sampling frequency and 16-bit
for bo h L and R.
The Metering timer and Grid display settings will also be reflected in Live
View shooting.
148