Hi, One of my customer ask me to install a dvr with 4 cameras in a meeting room. They want the people and their conversation recorded as the proof for future use.Can you recommend a low cost dvr which can record video and audio at the same time such as a camcorder do? It also can backup the recording to a flash drive or a DVD something like that, When the customer take the backup recording DVD to a court for example, It should have video and conversation on it.