GW Security Inc. 2CHV7 Professional 650TV Line, 3.6mm Lens, 24 LED, 4 Channel 960H and D1 with 2 x 1/3-Inch HDIS CCD Security Camera (Colorful) 4 Channel H.264 video compression format; support 960H & D1 resolution HDMI output for better resolution HI 3520D CPU New GUI PTZ Control Multiple operation modes (Preview, record, playback, backup, network surveillance and Mobile monitoring) USB2.0 backup, upgrade and mouse operation 650 TV lines0.1 Lux minimum illumination Auto Gain Control Auto Electronic Shutter0.45 Gama Characteristic