EverFocus EN-7515C Instruction Manual page 15

Press the (▶) or ENTER button and then up(▲)/down(▼) button to select the desired Mute.
Press the MENU button to save.
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INSTRUCTION MANUAL
4. Volume
Press the up(▲) / down(▼) button to select the Volume.
Press (◀) /right(▶) button to adjust Volume.
Press the MENU button to save.