Night Owl’s WM-845-624 is an advanced 8 channel / 4 hi-resolution (600 TVL) camera Security System with pre-installed 500GB hard drive that is fully controllable on your Smartphone, Tablet, PC or MAC. With motion activated email alerts and easy Smartphone access, this Night Owl system gives you true 24/7 video security day or night no matter where you are located in the world. In addition, all WM Series DVRs are accessible over the internet via PC and MAC computers. The included Control Management Software (CMS) for PCs gives you the ability to monitor multiple locations on one computer screen. Purchase up to 100 different WM Series security kits and access all of them at once with the included CMS software. The 4 hi-resolution cameras are equipped for night vision up to 50FT away in complete darkness. These sleek cameras are small enough to be placed inside or outside and offer 600 TV Lines of resolution. The 4 cameras come with 60FT of cable per camera and can be extended if needed.