4 channel, 56Mbps bandwidth, up to 1080P decoding, 2ch 1080P preview&playback, 1 VGA/1 HDMI, 1 RJ45, 2 USB, Two-way talk, 3.5"HDD -1 (up to 4TB), Support network cameras: Dahua, Arecont Vision, AXIS, Bosch, Brickcom, Canon, Honeywell, Panasonic, Pelco, Samsung, Sanyo, Sony, Vivotek