Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 183)

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z When flash is used, there will be two shutter sounds, but only one shot will
be taken. Also, the time it takes to take the picture after you press the shutter
button completely will be longer than with viewfinder shooting.
z If the camera is not operated for a prolonged period, the power will turn off
automatically after the time set in [ 5 : Auto power off] ( = 261). If [ 5 : Auto
power off] is set to [Disable] , Live View shooting will end automatically after
30 min. (Camera power remains on.)
z With the HDMI cable, you can display the Live View image on a TV set
( = 305). Note that no sound will be output. If the picture does not appear on
the TV screen, check if the [ 5 : Video system] is correctly set to [For NTSC]
or [For PAL] (depending on the video system of your TV set).