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 fast and easily identify the channels with interference? How to connect a mobile device to the HollyView App ? Can we use mushroom antenna on the MARS 400S ? How to change the video input and output format? Comments 0 comments Article is closed for comments.