4CH Tribrid 1080N Real Time Recorder H.264 dual-stream video compression4CH PlaybackTribrid ( IP+CVI+CVBS ) N+M [4+1 IP up to 2 Megapixel (20 Mbps) ]1 Audio Input / 1 Audio Output1 SATA Port , Up to 6 TBVoice over Coax Support HDMI , VGA ,simultanous video OutputRS485 for PTZ support2 USB 2.010/100 Mbps LAN InterfaceP2P Support