With incredible video quality, ease of use, and powerful networking tools, Revo Ultra is the very best that Revo has to offer. The Revo Ultra's superb video quality is based on IP technology. The “RU162D4GB12GA-4T” is a complete plug and play HD surveillance system with 16 CH 4K NVR, 3TB & 16x 4MP HD Indoor/outdoor Audio Capable Cameras. The REVO ULTRA NVR is powerful featuring state of the art H.265 Compression, up to 12 Megapixel Recording and 4K video output. The H.265 Cameras feature massive 2K Sensors, double the resolution of standard 1080p and are equipped with a built-in microphone for audio streaming and recording. The cameras are built for the outdoors capable of handling temperatures as hot as 140F and as cold as -40F. The “RUCD28-1” dome camera features a 2.8mm fixed lens for super wide field of view coverage. It also comes equipped with 18 IR LEDs that will illuminate the scene up to 75’ in total darkness. The “RUCB36-1A” Bullet Camera features IR anti reflection glass and a 3.6mm fixed lens for a wide field of view coverage. The built-in Professional Grade “OSRAM” LEDs strongly illuminate the scene up to an unprecedented 100’ in total darkness. The polished look and intuitive feel of the Ultra's interface is a joy for everyday use whether you're using the NVR itself, the Mobile App, Computer Software or Browser.