Intercom Harsh Noise Issue
Learn why harsh noise occurs during intercom and how to resolve it.
Why does the phone and device produce harsh noise during intercom?
This is caused by audio feedback (self-excitation) between the device's speaker and the phone's microphone. It's similar to the feedback noise you might hear when singing in a karaoke room (KTV) — the microphone picks up sound from the speakers and creates a loop.
Solution
Simply move your mobile phone away from the device. Since this product is designed as a remote monitoring intelligent device, this issue will not occur during normal use when the phone is at a distance from the device.
UBox App Documentation