With incredible video quality, ease of use, and powerful networking tools, Revo Ultra is the very best that Revo has to offer. Enjoy additional professional and premium-residential features with Revo Ultra Plus™. The Revo Ultra's superb video quality is based on IP technology. The “RUP321MD12B12-8T” is a complete plug and play HD surveillance system with 32 CH 4K NVR, 8TB pre-installed HDD & 24x 4MP HD Indoor/outdoor Audio Capable Cameras. Revo Ultra Plus™ NVRs feature state of the art 4K Video Output, H.265 Compression, support up to 12MP Cameras and up to an astounding 32TB of Hard Drive Capacity (8TB Pre-installed). The RUCD28-1 Vandal-Resistant Network IR Mini Dome camera and RUCB36-1AC Bullet Camera deliver incredible video quality with Optical WDR (Wide Dynamic Range), 3D Digital Noise Reduction, H.265 Compression and massive 4 Megapixel resolution, double the resolution of standard 1080p HD. The Revo cameras also come equipped with built-in Microphone for audio streaming and recording, Smart IR for superb Night Vision quality, widely compatible ONVIF conformance, 4KV surge protection and triple stream capability. Revo Ultra cameras are built for the outdoors, capable of handling temperatures as hot as 140F and as cold as -31F, rain or shine. When it comes to surveillance, every detail count.