@ Synchronized 4 channel video and 4 channel audio input recording, one channel video and one channel audio output, quad or single display. @ 4 channel alarm input(light-coupled isolation). 2 alarm output(relay isolation). @ 4 IDE interface, direct drive 8 large capacity hard disk(include capacity larger than 137Gbyte hard disk), recording capacity is determined by the user according to hard disk's total capacity and image quality. Special hard disk interface design and read-write control, enormously improved life span and reliability of the hard disk. @ Can do extra-low code stream recording, each channel one hour use at least 120-160M of the hard disk, clear image. @ 9 recording image quality grades for option(6 grades set by manufacturer, 3 grades set by user), resolution of VCD, SVCD and DVD. Definition of single display replaying can be above 240 TV lines. @ Simple form Chinese, complex form Chinese and English, three kinds of language for option. @ Can continuous recording, circulate recording, wait-alarm recording, timing recording, video loss alarm. Support motion detection, total 16 detection area of any size, 9 grades sensitivity setup. @ Can do speed searching according time, alarm status and recording date saving location. Recording content replaying include several modes of speed forward, speed backward, last section, next section and single step. @ Have backup interface, directly support CD and hard disk backup. CD content can be played directly in SVCD, DVD, or PC. @ Surveilling, recording and replaying processed at the same time, no need to stop present recording operation. @ Power off recording content protection, resume when power on. @ High peed 100M Ethernet communication, support speed real-time remote image transmit, file backup and recording information pick-up. Support RS485 multi-PC control protocol, network control and Pan/Tilt/Zoom control. @ Good UGI(User Graphical Interface), 3D menu and dialog box, convenient operation. Remote Control @ Multilevel password and purview setup, ensure recording information credible and reliable. @ System program applies CD or network update, ensure the system more safe and credible. @ Support PAL and NTSC. @ Dimension.: 420mmX375mmX100mm Package:520mmX480mmX210mm @ Net Weight: 8Kg,Gross Weight: 10Kg.