VideoSecu 4 Channel Stand Alone Security Surveillance DVR Digital Video Recorder System Including 4 Outdoor Infrared CCD Security Cameras, 4 Extension Cables, 4 Power Supplies and 2TB Hard Drive WP2 Real time 4 channel H.264 compression triplex real time industrial DVR with 2TB hard drive Support daylight saving time, PIP and EZOOM function Two USB interface, one for data backup, one for mouse operation Special file system for security. Support iPhone, Google Phone Support the live video, parameter setting and copy playback video via network