CPD531, 4CH MPEG-4 real time Digital Video Recorder. It includes features such as MPEG-4 compression format (recording & remote video), independent remote live viewing, superior real time performance with 120 IPS (NTSC) / 100 IPS (PAL), USB backup function, advance motion trigger recording, and pentaplex functions. All the benefits of this product are created to secure your life every time and everywhere. Back Panel