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Description:Product Name: Digital Video Recording(JDR-339) Model Number: JDR-339 Place of Origin: China Product name:DVR Product number:JDR-339 Video Input Format:NTSC/PAL Operating System:None Video Input:Channel 4 CH Composite Video Output:Channel 2 CH Composite Display Frame:NTSC:120fields/s(4*30fields/s) PAL:100 fields/s(4*25fields/s) Recording Frame Rate:NTSC Max:30fps PAL Max:25fps Compression Format:Modified MJPEG(120K/frame) Recording Mode:Continuous,manual,event,programed. Resolution:Display:NTSC:720*480,PAL:720*576 Recording:NTSC:320*112,640*272 PAL:320*136,640*272 Compression Format:Modified MJPEG (10-12K/fram) HDD:40GB(Removable) HDD≤200G Back-up(Archive device):HDD,VCR Full Duplex:Yes External Components Needed Multi-Channel Recording/Search:No Network:Yes External Components Needed Audio:No Sensors:Alarm:4 Inpu, 1 Output PTZ:No Motion Detection:YES Exterbak IR or microwave sensor Dimension:390mm*310mm*45mm(W*D*H)