Recorder Series: Platinum Series. Recorder Channel: 24-Channel. Recorder Case: 2U Case. Recorder Technology: DVR. Video Compression: H.264. Analog and HD-TVI Video Input: 24CH. Video Input Interface: BNC (1.0 Vp-p, 75 ?), PAL / NTSC self-adapive. IP Input: Add up to 16CH (1080P@30fps). Audio Compression: G.711u. Audio Input: 16-CH, RCA (2.0 Vp-p, 1 k?). Two-way Audio Input: 1-CH, RCA (2.0 Vp-p, 1 k?). HDMI/ VGA output: 2 HDMI (1 Spot Out) / 1920 x 1080/ 60 Hz, 1280 x 1024/ 60 Hz, 1280 x 720/ 60 Hz, 1024 x 768/ 60Hz. Encoding resolution: Main Stream: 1080P (Non-Real-Time)/ 720P/ VGA/ WD1/ 4CIF/ CIF. Sub-Stream: WD1 (12fps)/ 4CIF (12fps)/ CIF/ QCIF/ QVGA. Frame rate: Main Stream: 1/16 fps ~ Real-Time Frame Rate. Sub-Stream: 1/16 fps ~ Real-Time Frame Rate. Video Bit Rate: 32 Kbps-6 Mbps. Audio Output: 1CH, RCA (Linear, 1 k?). Audio Bit rate: 64 Kbps. Dual-Stream: Support. Stream Type: Video, Video & Audio. Synchronous Playback: 24CH. Playback Resolution: 1080P / 720P / V GA / WD1 / 4CIF / CIF / QVGA / QCIF. Remote Connections: 128. Network Protocols: TCP / IP, PPPoE, DHCP, DNS, DDNS, NTP, SADP, SMTP, SNMP, NFS, iSCSI, UPnP, HTTPS. SATA: 8 SATA Interfaces for 8 HDDs; 1 eSATA Interface. Capacity: Up to 6TB Capacity for Each Disk. Network Interface: 2:10M / 100M / 1000M Self-Adaptive Ethernet Interface. Serial Interface: RS-232, RS-485, Keyboard. USB Port: 3 x USB2.0. Alarm In/ Out: 16/ 8. Power Supply: 100 ~ 240VAC, 47 ~ 63HZ. Consumption: ? 60W. Working Temperature: 14?F - 131?F (-10 ?C ~ +55 ?C). Working Humidity: 10% ~ 90%. Casing: 19in Rack-Mounted 2U Casing. Dimensions (W x D x H): 17.5 x 18.5 x 3. 5in (445 x 470 x 90mm). Weight: 17.6lb (? 8kg). ***Hard drive is not included***