My Philips Avent baby monitor makes a high-pitched noise
- The parent unit and baby unit may be too close to each other. Make sure the parent unit and the baby unit are at least 2.5 meters / 6.7 feet away from each other.
- The volume of the parent unit may be set too high. Decrease the volume of the parent unit.
- For causes of a beeping sound from the parent unit, see the troubleshoot “My Philips Avent baby monitor parent unit is beeping.“.