How to fast and easily identify the channels with interference? Hollyland Tech November 30, 2020 11:09 Long press the "ok" button into the menu page on RX Select “Channel Scan” “√” means the channel is clear of interference while “×” means it is with interference Related articles Why does my device show ''CH-'' or " ERROR CODE 1"? How to change the video input and output format? why the audio and video are not synchronized？ Can we use mushroom antenna on the MARS 400S ? Did the DC adapter charge for batteries ? Comments 0 comments Article is closed for comments.