H.264 video & G.711u audio compression 4CH Hybrid DVR (960H & TVI camera input) Dual Stream(Main:720p (30fps), Sub: 960H (12fps), CIF (30fps) Recording: 960H & 720p (25 / 30fps), 1080p (12fps) HDMI and VGA output up to 1920 x 1080p resolution Smartphone application for iPhone and Android phone Audio input (1ch) / output (1ch) UTC (TVI format Only): In case of using D-max TVI PTZ Camera, you can control it without any data cable RS-485 for PTZ camera, Digital Zoom (Live / Playback) Supports 1 HDD (4TB capacity)