Operating System: Embedded Linux Display Size: 29.46cm (11.6) LCD screen Resolution: 1366(H)×768(V) Luminance :220cd/m2 Frequency Range: 2.4G WiFi Cameras Supported: 4 Channel Power Supply: Self – generating Frequency Range: (Door Bell) 433MHz/315MHz Ring: 25 polyphonic ring tones System Resources :Simultaneous multi-channel real-time recording, playback, network operation, USB backup Preview: 1/4 Screen Video Input (CAM): 4 Channels (4*1080P) Video Compression: H.264 Recording Resolution: 720P/960P/1080P Playback Quality:1080P/960P/720P Motion Detection: Support Audio Compression: G.711A Local Payback: 4*720P Record Storage: HDD Network Backup Mode: Network backup, USB Antenna: External Antenna Network Interface: 1*RJ45 10M/100M, self-adaption USB interface: 1*USB2.0 ports HDD: 2.5″ HDD Optional 500GB/1TB/2TB ONVIF: Support Network Protocol: Support DHCP, DNS, DDNS, NTP, EMAIL,IP searches etc. Power Supply: DC 12V/2A Power Consumption: 15W (Including HDD)