After adding the device, why does the phone and the device turn on the intercom with a harsh noise?

Answer: This is because the sound of the device and the ICof the phone are self-excited, which is like singing in KTV, andthere’s a similar self-excitation in the MIC and the speakers. When meeting this situation, take your mobile phone away. This product is a remote monitoring intelligent device; therefore, normal use will not have this problem.