GYYR is a very old surveillance manufacturer who has long been gone. However at CU1 we still do get the occasional call for possible replacements or old stock of their equipment.
We no longer have any GYYR equipment available however if you seek any manuals or information on their product line that you may have purchased in the past we may be able to help you there.
Furthermore if you seek replacement items or comparable equipment we would be more than glad to assist in finding a solution to your problem.
Go here for GYYR manuals or give us a call for more information.
http://www.cu1.com/cusdessys.html-CU1 Team