High video quality based on H.264 USB port connect thumb Drive Compact size&light weight ... JapaneseInterfaceGraphical User InterfaceSecurityAdministor and user password protectedVideoVideo Input1/2/4 channel video input, 1.0V, p-p,75Ω,BNCVideo Output1 ... StandardPAL (25fps) NTSC (30fps)AudioAudio Input1/2/4 channel audio input, 20KΩ,RCAAudio Output1 channel audio output, 500Ω,RCAOutput level1V ~2V, ...