1. During two-way intercom, there is no sound from the mobile phone. Check the method:

1. The APP should be smooth when viewing video images. If the image is very stuck, it will affect the sound transmission.

2. Please check whether the “microphone” of the “rights management” APP of the mobile phone is turned on

3. Check whether the “Intercom” button and “Sound” button under the watch video screen are playing

4. Turn the phone volume to maximum

2. During two-way intercom, there is no sound on the device side. Check the method:

1. If it is a doorbell device, please press the doorbell key to check whether the doorbell is ringing. If it does not ring, it means the doorbell horn is broken.

2. If it is a camera, please press the reset button once or click the “sos” button to check whether the device sounds, if there is no sound, please repair after sale.

3. The APP should watch the video image smoothly. If the image is very stuck, it will affect the sound transmission.

If the above methods do not work, please restart the device after power off and the phone once.