Defender&reg; Sentinel Wireless 4 CH 1TB DVR with 2 Wireless 520TVL Cameras with 75ft Night Vision ClearVu Digital Wireless Technology  Up to 450ft 1TB HDD for up to 4 Years of Memory Night vision up to 75ft View anytime, anywhere on smartphone, tablet , PC or Mac Cast aluminum, vandal-resistant, camera housing optimized for outdoor use