You have until Feb 1, 2018 to return or exchange items bought after Nov 1, 2017. All other standard return policy
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The ACTi Add-On License activates a single channel on the XNR-4200 Rack Mountable Standalone NVR. An IP camera or video encoder can be added to the activated channel. The XNR-4200 NVR features up to 48 add-on channels.