NVR full name is Network Video Recorder(NVR). NVR support 4 channels, 8 channels, 16 channel, D1/CIF resolution is for optional. NVR is similar to DVR but some distinctions are different. NVR video input from IP Camera like megapixel IP Camera, WIFI IP Camera, POE IP Camera. NVR apply in home, small shop, supermarket, hospital, bank, police station, which preview video from NVR's VGA port. From NVR device manage IP Cameras, preview image, and recording video.