Specifications: Models: HK-HK-S1004E/HK-S4004EN > signal system: NTSC/PAL > Operating system: Embedded RTOS > Video input:4 pairs > Video output:2 pairs > Display Speed: NTSC:30/120/240 fields/s(4X30 fps) ; PAL:25/100/200 fields/s(4X25 fps) > Recording Speed(Partition mode): NTSC: Max.30fps; PAL: Max.25fps > Recording Speed(Single channel mode): NTSC: Max.7.5fps(30 fps/4) ; PAL: Max.6.25fps (25 fps/4) >Resolution Display: NTSC:720X480;PAL:720X576 > Resolution Recording: NTSC:640X224(Each Channel) 640X272(Quad Total) > Compression Form: Modified MJPEG (High:20K bytes/frame; Normal:15K bytes/frame; Low:12K bytes/frame) > Hard Disk:30G-120G > Search Mode: Time, date, camera ; >Full screen: Yes > System monitoring: Stop, and automatically rebooted to recording mode on restored power supply > Power requirements: AC100V-240V,50/60HZ > Dimensions (WXDXH): Package size:500mmX330mmX130mm; External Shape size:485mmX250mmX50mm > Network: Support > Weight: Gross weight:4kg ; Net weight:3.5kg