Did the APP support transmission audio? Hollyland Tech December 24, 2020 06:44 Updated Yes, the Hollyland APP support transmission audio. Related articles why the audio and video are not synchronized？ How to connect a mobile device to the HollyView App ? How to change the video input and output format? How to fast and easily identify the channels with interference? Can we use mushroom antenna on the MARS 400S ? Comments 0 comments Article is closed for comments.