Reer Rigi 400 Notice D'utilisation page 23

Loud whistling tone from the parent unit (feedback)
The baby unit is too close to the parent unit. Increase the distance between the baby
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unit and the parent unit.
No connection between parent and baby unit / random noise / connection is lost
Make sure that both units are switched on.
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Check the channel setting and/or change the channel.
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The maximum range has been exceeded. Move the baby monitor to a different position
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and/or reduce the distance between the baby and parent unit.
The baby/parent unit is close to interfering devices (e.g. microwave) or metal objects.
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Try to find the source of interference and move the units to a different position.
The batteries are almost depleted. Replace the batteries or connect the units to the
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power supply.
Troubleshooting
GB
23