Detailed Product Description Brife introduction 4--CH Vehicle DVR, support network,GPS and Hard Disk (500GB---1000GB), 4 channels record at the same time, with video divided function and display 4 pictures on screen, it is the best choice for a car,bus,taxi,etc. Main function: 1.4-CH record at the same time 2.support Hard Disk from 500GB to 1000GB 3.transmit data via USB port 4.Surveillance resolution:PAL:720*576, NTSC:720*480 5.Record resolution: PAL:720*288, NTSC:720*240 6.Can input car licence and save video according to the name of car licence 7.support GPS function 8.Input power 12V---24V, Output power DC12V 9.Can supply power to 4 cameras 10.with power switch lock and Hard Disk lock 11.with shakeproof function Operation Simple Hard Drive 500 GB 1000GB Ethernet 10/100 Base T DVR DVR, including software monitor, recording and playback by each camera Back up 1-Sata port Video Visualization Single, quad, Single sequential Recording Mode Continuous recording speed PAL Format: 50 fps NTSC Format:60 fps Minimum resolution in the recording PAL:720*288, NTSC:720*240 Searching Backward / forward backward / forward Special Features Motion detection & Record all the time Video Connector 4 inputs and outputs BNC or RCA compatible with the cameras supplied by our company Connector RJ45 DHCP, DDNS Static Alarm Imput 1 Alarm output 1 Operating temperature 32ºF-104ºF/ 0ºC-40ºC Operating Humidity 85% Max Power Supply 12V--24V Compatible With Windows XP& windows Vista Warranty 1 year Video Compression MPEG2--- MPEG4