EverFocus TFT-LCD MONITOR EN-75084C - Manual (Page 14)

3. Mute
1) Press the up(▲) or down(▼) button to select the Mute.
2) Press the right( ▶) or INPUT button.
3) Press the up( ▲) or down(▼) button to select the On or Off.
4) Press the MENU button to save.
4. Volume
1) Press the up( ▲) or down(▼) button to select the Volume
2) Press the left (◀) or right(▶) button to adjust Volume setting.
3) Press the MENU button to save.