No HDD. The Dahua 5000 Series HDCVI recorder features WizSense technology which is a series of AI products and solutions that adopt independent AI chip and deep learning algorithm. It focuses on human and vehicle with high accuracy, enabling users to fast act on defined targets. Based on Dahua's advanced technologies, WizSense provides intelligent, simple and inclusive products and solutions. This 4 channel XVR5104HS-4KL-I3 offers maximum full channel SMD Plus to benefit from AI upgrade with powerful decoding capabilities utilising face recognition, perimeter protection and SMD Plus (Smart Motion Detection) technologies. It is compatible with a wide variety of third party devices and is available with a choice of different capacity hard disk drives.. H.265+/H.265 dual-stream video compression. Supports HDCVI/AHD/TVI/CVBS/IP video inputs. Supports all-channels AI Coding. Max 8 channels IP camera inputs; each channel up to 8MP; Max 64 Mbps incoming bandwidth