LaView HD 720P 4 Camera Security System, 4 Channel 720P HD-TVI Analog DVR w/ 1TB HDD and 4 720P HD White Dome Turret Surveillance Cameras 4 Channel HD DVR with 1 BONUS channel brings 720p high def. resolution to an analog system. Bonus channel allows for one network IP camera connection with real-time recording and playback DVR comes fully equipped with pre-installed 1TB hard drive and is capable of being upgraded to a 6TB hard drive In emergency situation, the Smart Search feature can save precious time by targeting detected motion in designated locations Each dome turret camera delivers night vision up to 65 feet (nearly the length of a tennis court) for 24-hr protection. HD quality enhanced by DNR and Smart IR feature gives you ultimate clarity LaView Net, our free downloadable app, enables live view and playback on iOS and Android devices remotely with a simple QR code scan.