Defender 4CH 1TB DVR with 2 Wireless 520TVL Cameras and 75ft Night Vision, 21317 ClearVu Digtal Wireless Technology 450ft Range of Private and Secure Digital Signal 2 Weather Resistant 520 TVL Cameras with 75ft Wide-Angle Night Vision 1TB HDD Delivering Four Years worth of Storage Free ClearVu App for Viewing Video Footage right on your Smartphone