How many mobile device are supported for the the MARS X at the same time? Hollyland Tech December 25, 2020 09:52 Updated Up to 3 devices are supported in real-time. Related articles what is the MARS X wireless transmission range？ Does the MARS X support HDMI LOOP OUT? How to connect a mobile device to the HollyView App ? MARS 400S Guidance With Panasonic GH4 How to connect the MARS X to APP? Comments 0 comments Article is closed for comments.