... SATA,4 USB, >Free PSS software NVR3804V: 4 channel@D1, 4 channel@720P, 4 channel@1080P IP camera inputs, ... It also can support voice intercom function.NVR3808V: 8 channel@D1, 8 channel@720P, 4 channel@1080P IP camera inputs ... Keyboard, NetworkVideo & AudioIP Camera Input4ch@D1 / 4ch@720P / 4ch@1080P8ch@D1 / 8ch@720P / 4ch@1080P16ch@D1 / 8ch@720P / 4ch@1080PIP Camera Supported ListArecont Vision, AXIS, ...