1. H.264 Standalone DVR 2. Support SATA HardDisk,Mouse,USB ... . Audio, RS485, IE browse,15 languages 4.HDD,alarm H.264 main profile compression algorithm ideal for standalone DVR4 channels ... exact search(accurate to second)Storage & BackupSpace OccupationAudio 28.8MB/H ;Video 25-450 MB/HRecord StorageLocal Hard disk and NetworkBackup ... ) * 58MM (highly)Weight2.38KG 4CH Full D1 Real Time H.264 CCTV DVR