Grandstream GVC3552 Network Video Recorder (NVR), 1 x Gigabit Ethernet, H.264, 1 x HDMI, 1 x VGA, supports up to 2 hard drives (maximum 4TB storage), 2 x USB 2.0, supports Grandstream IP cameras and third party ONVIF compliant SIP cameras. (GVR3552_XX)

http://www.grandstream.com/sites/default/files/Resources/gvr3552_english_datasheet.pdf