Hollyland MARS 400S Faq page 5

 APPLICATION
1. How to set them up when multiple sets of MARS 300 PRO are used at the same location?
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Choose different frequency channels with the number difference between each two channels bigger than 2
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Place each RX at least 0.5m away from the other
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Place all RX 1.7m above the ground
2. Why there is no video output when recording 4K?
This is limited by DSLR/Mirrorless cameras. We suggest you use the mobile App to monitor the feed, or connect the camera to an
ATOMOS monitor first, then output the feed to the device.
3. Why there is no video display when using the system with a switcher?
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Check if there is Video Format on the screen of Transmitter
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Based on the requirement of the switcher, output format of camera should be set to 1080p/i
4. Why there is no video when using a SONY camera?
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HDMI Control: Off
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HDMI Display: Camera and HDMI at the same time
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HDMI info Display: Off