Swann DVR16-4400 16 Channel 720p Digital Video Recorder w/ 8 x PRO-A850 Cameras A state of the art surveillance system with video technology equivalent to 720p HD resolution Set & forget by recording continuously from 16 channels for 15 days+ onto a 1TB hard drive, even longer with motion detection Seeing is believing with 8 x 720p HD Cameras (1 Megapixel) Expand by adding 8 Swann PRO-AXXX cameras of your choice for full 16 channel monitoring Save time & have peace of mind by easily locating incident video, then transfer to external storage via USB or network