With incredible video quality, ease of use, and powerful networking tools, Revo Ultra is the very best that Revo has to offer. Its unique design complements any home or business. The Revo Ultra's superb video quality is based on IP technology. The RU1624KBNDL-2 is a complete, plug and play HD surveillance system with 16 channel NVR, 4TB, and 8x 4K audio capable IP turret cameras. The REVO ULTRA NVR is powerful featuring state of the art H.265 Compression and 4K video output. Revo Ultra turret cameras feature 2.8mm-12mm Motorized Varifocal Lens which provides an adjustable 47 to 115 degree angle of view. These cameras have a built-in microphone for audio streaming and recording. They also come equipped with Smart commercial grade “OSRAM” LEDs. They strongly and evenly illuminate the scene up to an unprecedented 175' in total darkness. Night vision video quality is unmatched. The cameras are built for the outdoors, capable of handling temperatures as hot as 140F and as cold as -31F. S.M.A.R.T. technology enables the system to monitor its own health and alert the user of any malfunction. 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.