The Swann DVR8-2550 & 4 PRO-550 CCD Cameras Security Monitoring System delivers everything you need to defend your home or business, safeguard your loved ones and deter intruders. It is cutting-edge surveillance technology made easy, at an affordable price. With 8 channels to choose from, you can add 4 more cameras of your choice to ensure all the important locations at your premises are protected. Use the DVR's remote control or push button controls to view 8 channels at once, quad view or 1 channel at a time. It's up to you. The system includes a state-of-the-art 8 Channel DVR8-2550 digital video recorder for simultaneous viewing and recording of 8 video streams locally, over the Internet or on your 3G Smartphone. The unit has H.264 video compression for fast, efficient recording and playback. You can also adjust the frame rate and image resolution with CIF real-time recording on all 8 channels (30fps per channel, 120 fps total) and the ability to adjust the recording settings for each camera to the resolution you choose from 352 x 240 pixels (CIF) up to 704 x 480 pixels (D1). The four Day / Night Cameras provide crystal clear video through their high resolution 420 TV Lines 1/4"" Sony CCD image sensors with night vision up to 50 feet and the ability to operate indoors and outdoors. + 60 days recording achieved using lower settings, default settings give 7 days recording.