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We received two shipments to our location and when viewing the items I found that they don't have a manufacturer year. Where would I go to get this information.
Thank you for your inquiry. Adder does not list the manufacturing year on the product labels. However, if you can provide them with the serial numbers of your products, they can look them up for you.

You can contact Adder support directly at: http://www.adder.com/support.
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What is the maximum screen resolution this KVM supports?
Thank you for your inquiry. According to the manufacturer, this KVM will support resolutions up to 1900x1440.
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How many monitors can I connect to this device?
Thank you for your inquiry. This device supports a single monitor connection.
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Is there a way to daisy chain these together to increase the nuumber of Users from 4 to 8?
Thank you for your inquiry. Unfortunately, we do not believe you can cascade this device to add additional users.

Depending on your particular needs, you might be interested in taking a look at the Adder DDX30 KVM matrix system (https://www.kvm-switches-online.com/ddx30-us.html), which will support 7 or more users.

If you would like, please feel free to contact your KVM Switches Online representative directly at 1-877-586-6654 or via our online chat feature to discuss your project in greater detail.
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