HDView 20CH Tribrid: 16 Channel DVR + 4 Channel NVR, 2.4MP 1080P HD Megapixel Security Camera Surge-Protection HD-AHD DVR Kit, 16 x 2.4MP 1080P Infrared Cameras Package System DVR Supports: 18CH Tribrid: 16 Channel Megapixel HD-AHD and 960H Cameras + 4 Channel 3MP ONVIF IP Cameras 16 x 2.4MP 1080P Infrared metal outdoor/indoor cameras, mount on ceiling or wall NO Hard Drive Installed Free Advanced Commercial Grade Phone App [Recommend Same Series HDView Brand Camera] P2P QRCode Scan, Free CMS software and DDNS Server