Orion Premium 15rtc Cctv Lcd Monitor 15RTC 用户手册
3. Mute
Press the up(▲) / down(▼) button to select the Mute.
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