H.264 compression,4 channel standalone dvr,support SATA HardDisk, Mouse,USB,network,IE browse ... SignalPAL(625Line,50f/s), NTSC(525Line,60f/s)Video Input4 channel, BNC , 1.0V p-p/75ΩComposite Video Output1 ... , 1.0V p-p/75ΩMonitor Video Output1 channel, BNC, 1.0V p-p/75ΩVGA Interface1 VGA, Resolution: ... *H)WeightN.W:2.5KG G.W: 2.8KG 4 Channel Standalone DVR, H.264 Compression DV-7504