The Swann SWDVK-425504C Surveillance System includes a state-of-the-art 4 Channel DVR4-2550 digital video recorder for simultaneous viewing and recording of 4 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 real-time recording on all 4 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 clear video through their high resolution 400 TV Lines 1/4" Super CMOS image sensors with night vision up to 33 feet and the ability to operate indoors and outdoors.