1. Work 16pcs 2MP cameras at the same time, and support 4pcs 2MP cameras playbacking . 2. Work 16pcs 3MP cameras at the same time and support 1pcs 3MP cameras playbacking. 3. Work 4pcs 5MP cameras and 12pcs 2MP cameras at the same time and support 1pc 5MP camera playbacking. Support one hardisk , one SATA interface , support up to 6TB hardisk . (The hard disk is not included) Support HDMI and VGA output. The output resolution is up to 1080p(HDMI&VGA). And support the maximum HD video streaming of 5MP camera view and playback. Support backup by USB or Network. It can be easy to backup to USB disk or Hardisk. Compatible models: CS661/CS55/CS58/C662DR/CS69/CS667-X18