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VGA KVM switch 4 in and 1 out 41U with audio
https://www.eklhd.com/product/kvm_41u.html -
HDMI® KVM switch 4 in 1 out 41HK
https://www.eklhd.com/product/kvm_41hk.html -
20km 4-channel two-way audio optical transceiver 4SA
https://www.eklhd.com/product/extender_4sa.html -
HDMI® extender WE100 instruction manual download
https://www.eklhd.com/download/extender_we100.html