Q-See QS494-411-5 4 Channel Security Surveillance DVR System with 500 GB Hard Drive and 4 Weatherproof Color Cameras, Black Stream Live Video Directly to a remote MAC or PC, iPhone, iPad, or Android. Receive email alerts upon motion detection. Includes 4 Indoor/Outdoor Cameras with 400 TV Lines of Resolution. Each camera provides up to 40ft of night vision Comes with a pre-installed 500GB Hard Drive Remote Internet monitoring (up to 5 users at the same time)