>This is a good tool to have around when you are in a cubicle setting where your back is to everyone. No one likes being creeped up on. Slickdeals discusses the product: http://forums.slickdeals.net/showthread.php?sduid=0&t=454602
You can buy it here:
http://tekgems.com/Products/et-29789-vcd-td-208.htm