M-JPEG compression; Embedded Linux; Preview Resolution; PAL: 704*576     NTSC: 704*480; Compress Resolution: PAL: 704*576     NTSC: 704*480; 4ch Video input, 1ch Video output; Display Frame Rate: PAL: 100FPS;   NTSC: 120FPS; Record Frame Rate: PAL: 25FPS;    NTSC: 30FPS; 1ch Audio input and 1ch Audio output; 1ch alarm input and 1ch alarm output; Support 1 SATA HDD(≤500G); HDD , Power/ Consumption: Input:100-240V AC/1A Output:DC12V/4A ,≥25W; Temperature/ Humidity: -10℃～＋55℃；10%～90%; Size / Weight: 330mm*285mm*50mm , 1.9Kg