... channel@D1, 8 channel@720P, 4 channel@1080P realtime recording KD-D1504N: 4 channel@D1, 4 channel@720P, 4 channel@1080P ... , It can support HDMI, VGA, USB2.0 and 2 HDDs.KD-D1508N: 8 channel@D1, 8 channel@720P, 4 channel@1080P ... , It can support HDMI, VGA, USB2.0 and 2 HDDs.KD-D1516N:16 channel@D1, 8 channel@720P, 4 channel@1080P IP ...