H.264 HD DVR -H.264 realtime HD DVR -USB,PTZ,Audio,Network,VGA -SATA HDD up to 2TB -720p realtime recording 4 channel HD ... DVR Features: 1. H.264 Real-time Recording, support USB, PTZ, network ... SystemLinuxVideoVideo CompressionH.264Video Preview Resolution720P:1280*720Video Input4CH HD-SDIVideo Recording120fps@720PVideo Playback1ch Realtime or 4ch non- ...