Why does the Xiaomi Smart Camera C300 Dual have echoes during calls?

Several factors will lead to the echoes during calls, such as sound reflection from surfaces, the distance between the phone and he device and interference of electronic products.
If you experience echoes during calls when using the Xiaomi Smart Camera C300 Dual, please refer to the following details:
1. When making a call, please try not to place the phone and the device in the same space, and keep them at least 10 meters away from the device. The echoes caused by the close distance are normal phenomena;
2. If there are many electronic products near the device, electromagnetic interference will be generated, which will cause howling and noise during voice calls.