No HDD. The Dahua NVR4000 Series compact network video 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 16 channel NVR4216-16P-EI offers strong bandwidth 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.. Smart H.265+/H.265/Smart H.264+/H.264/MJPEG decoding format.. Max. decoding capability: 16 × 1080p at 30 fps (Supports adaptive decoding). AI by NVR: 1-channel face detection and recognition; 2-channel perimeter protection; up to 10 face databases and 20,000 face images; 4-channel SMD Plus.. AI by Camera: Face detection and recognition, perimeter protection; SMD Plus; people counting; stereo analysis; heat map.