How can I adjust video playback volume when connected to an external display via HDMI? You can adjust the volume using the TV's remote control. Related articles Is there sound during video playback and can I adjust the volume? How to increase or decrease the Kami Baby volume Does the YI Dome Camera 1080p support Two-way Talk? What type of display modes are supported via HDMI display? What types of HDMI cable does the camera support?