Haier L32R1, L40R1, L42R1 Owner's Manual page 24

Sound Control Functions
Eliminate Sound
When you need to pay attention to surrounded sounds,
or there is a telephone calling you or there are some
guests visiting you, the sound elimination (mute)
function is very convenient.
1
Press the MUTE button on the remote control and "Mute"
type face will display on the lower part of the screen. At this
Time, the sound of the TV set is turned off.
2
If you want to recover the sound, press the MUTE button
again or directly press VOL+ button.
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