Uniden LRD747 English Owners Manual - Page 17

WARNING To operate with visual alert only, set the volume control to the minimum. Remember though, if the volume control is turned down and Audio Only operation is selected, the alarm features are completely disabled. VISUAL ALERT ONLY OPERATION You can operate the LRD 747/LRD 757 in Visual Alert Only by setting the volume control at the minimum position in Full Alert Mode. At this setting you can barely hear the audio alert in a quiet environment. Be sure that the Audio Alert Only indicator is off. AUTO MUTE OPERATION Press the mute button to activate the Auto Mute feature. OPERATION When the Mute Indicator is selected, the unit is in Auto Mute Mode. In this mode you hear the full audio alert when a signal is first received. The audio alert automatically reduces to a chirp for the duration of the warning. 15