Defender Sentinel 4CH H.264 500GB Smart Security DVR Including 4 Ultra Hi-Res Indoor/Outdoor Cameras with 100ft Night Vision,21027 Monitor up to 100 feet away in complete darkness with automatic night vision Record over 2 years' worth of footage on the included 500 GB hard drive Easily connect to DVR with 65-foot cables to allow greater flexibility in camera situating Choose motion-activated recording or H.264 compression to maximize storage space