DVR holds up to 4 cameras maximum, viewable over internet. Connect externally to laptop or desktop computer through USB port. View on phones with Windows Media Player. Product Description: •4 channels video input in one card, the maximum display/recording rate is 25 fps under PAL format, and 30 fps under NTSC format. •1/4/6/8/13/16 screen display modes are available. •Multi alarm triggering method: sensor, motion, video loss, and HDD space shortage. •Support schedule recording mode, recycling recording method available. •MPEG4 video compression format. 5 level recording quality options available, and the recording frame rate range from 1 to 30 fps adjustable for each channel. •Support multi-channel playback, searching by time/date and recording events, images can be zoom/capture/save/print/backup. •Support remote surveillance and PTZ control through web browser, support dynamic domain name •Remote playback function. •Configurable auto reboot function for preventing PC deadlock. •Support Auto-Mail, E-map and smart phone