Swann SWDVK-444004A-US DVR4-4400 4 Channel 720p Digital Video Recorder and 4 x PRO-735 Cameras (Black) View & record from 4 channels simultaneously during the day, night, indoors or outdoors Be futureproof; this DVR is capable of supporting 720p HD video if you wish to upgrade your cameras in the future Set & forget by recording continuously from 4 channels for 30 days+ onto a 500GB hard drive, even longer with motion detection Seeing is believing with 4 x PRO-735 cameras perfect for front & back door areas & more Save time & have peace of mind by easily locating incident video, then transfer to external storage via USB or network