... as an example, others are depended on the selected channel mode)1/4 screen Video standardPAL(625 lines,50fps);NTSC ... an set multi-level of flexibility (for local analog channel only) Audio compression G711ABidirectional talk support Record mode manual>alarm>motion ... 25fps) Space occupation Video:CIF 4~5G/day*channel, D1 16~20G/day*channel; audio:691.2M/day*channelVideo storageLocal HDD ,NetworkBack up ...