ChibiSqueeze

Hi, can someone tell me what the motion detect audio warning does? My dad has a Donut Shop and I want to use this feature to have the DVR make an alert sound each time a customer comes in, sort of like a beam door motion detector. Can I use this feature for that purpose? Do I have to manually turn off the alert sound? My system: http://www.swann.com/us/swdvk-846004