... digital video recorder -H.264 realtime HD 720P DVR -USB,PTZ,Audio,Network,VGA -720p realtime ... record -2 HDD, 4TB 4 channel HD DVR Features: 1. H.264 Real-time Recording, support ... *2pcsOperation SystemLinuxVideoVideo CompressionH.264Video Preview Resolution720P:1280*720Video Input4CH HD-SDIVideo Recording120fps@720PVideo Playback1ch Realtime or 4ch non-realtimeVideo ...