Dual 4K HDMI® HDBaseT + VGA, 3.5mm, and RS232 over Cat Switching Extender Box Transmitter to Ultra-Slim Box Receiver - 4K 60Hz | HDBaseT Extenders | HDBaseT | Audio Video
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VGA to HDMI® Adapter Converter for Universal HDMI Adapter Ring | Adapters and Couplers | Audio Video
Pro AV/IT HDBaseT™ 4K60 18G HDMI Extender Kit with USB, Audio, LAN, RS232 up to 330ft
10ft/3m USB to RS232 Serial Adapter - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com Europe
2x2 HDMI Video Wall Controller, 1080P@60Hz HDMI DVI TV Wall Processor, 4K HDMI Video Image
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4K HDMI USB/Audio/RS232/IR KVM Extender over CAT5e or Fiber Kit - HKM0
USB to RS232 Adapter with PL2303 Chipset, CableCreation 6.6 ft USB 2.0 Male to RS232 Female DB9 Serial Converter Cable for Cashier Register, Modem, Scanner, Digital Cameras, CNC,Black - Walmart.com
SPLITMUX-HD-2RSLC - Low-Cost 2 to 1 HDMI Dual Screen Splitter/Multiviewer with IR & RS232
Pro AV/IT HDBaseT™ 4K60 18G HDMI Extender Kit with Audio, RS232, IR, PoC up to 492ft