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can you add a usb hub to connect printers and drives?
This switch is not designed to share peripherals and only has 2 USB ports for keyboard and mouse. In theory, you may be able to connect a hub such as https://www.kvm-switches-online.com/ext-usb-144n.html to one of the USB ports and use it that way. However, this product application has not been tested and we cannot guarantee the compatibility. We recommend using a switch such as https://www.kvm-switches-online.com/sw4-usb.html for this type of application.
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It says no external power required, but is there an optional external power adapter?
Thank you for your inquiry. Unfortunately, no, this switch does not support an external power adapter.
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I have a Logitech wireless keyboard and mousethat use the "Unify" dongle. Is it possible to plug it in one of the USB port?
Thank you for your inquiry.
Using wireless keyboards and mice is very hit or miss when it comes to KVMs. This is related to the very different way in which wireless peripherals communicate and a KVM\'s internal mouse/keyboard emulation. We cannot guarantee a particular wireless setup will work with a particular KVM.

That being said, customers who attempt to use wireless keyboards and mice find Avocent switches, like this model: https://www.kvm-switches-online.com/4sv120bnd1.html, to work best.

Again, it is a hit or miss proposition and we cannot guarantee any switch will work. For best performance and compatibility, we always suggest wired keyboards and mice.
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can i use it to connect 4 monitors to 1 cpu?
Thank you for your inquiry. Unfortunately, no, this unit is designed for four computers to share one monitor. To share 4 monitors with one CPU, you would need something like this: https://www.kvm-switches-online.com/vopex-c5va-4.html that splits the signal.
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Can you run a dual monitor setup with this KVM (using a Y-cable from the video output and plugging in two monitors)?
Thank you for your inquiry. This type of configuration may work, but it is not supported and would not be a true dual-monitor setup. If it worked, it would merely mirror the video output on two screens.

For a true dual-monitor setup, one would need computers that had two separate video outputs and a dual-monitor KVM. A selection of dual monitor KVM switches can be found here: https://www.kvm-switches-online.com/dual-head-kvm-switch.html.
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