Conventional door stoppers are good enough to jam your door thus making it move slowly but the one spoken of here is a touch better as it ensures a bit of safety as well. This exclusive door stopper comes with an on/off switch to an alarm that makes it a potent safety device. When you are alone in your house and want to be careful about the slightest movement in the main door, this could actually be your best friend. When the entire family is home, it could then come in handy to protect the warehouse robberies. Priced at $9.35, I am not quite sure as to what juices the alarm up but it most probably would be a set of AA batteries.