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https://www.gonsin.com/products/4-way-vga-seamless-input-output-card/

Features of 4-way VGA Input Card
GX-VGA4I-D
4 channels for VGA input, 4 channels for analog audio signal input

Supports resolution selection, and it is up to 1920x1080P@60Hz

Manually select VGA (RGBHV), YPbPr, S-VIDEO or C-VIDEO signal format

VGA signals support embedded analog audio, and audio and video

synchronization (if no video, embedded audio can not be transmitted)

Supports video upscaling, converting input video to 1080P or 1920x1200P

Input signal card with character overlay function

Support single port recovery factory settings

GX-VGA4O-D
4 channels for VGA output, 4 channels for analog audio signal output

Supports resolution selection, and it is up to 1920x1080P@60Hz

Manually select VGA (RGBHV), YPbPr, S-VIDEO or C-VIDEO signal format

VGA signals support embedded analog audio, and audio and video synchronization (if no video, embedded audio can not be transmitted)

Supports video upscaling, converting input video to 1080P or 1920x1200P

When the output board is set to CVBS, the default is PAL and can be set to NTSC

Support single port recovery factory settings

Now the price of audio video conference system is reasonable, if you have needs to buy video and audio conferencing system, please leave us a message.