Delidge Alarm-001BK Door Door Window Alarm  (Decible)

This noise maker will keep the unexpected guests away. You can also take it with you when you’re traveling and want to feel a little more comfortable while you sleep at night. This door stopper can be slipped in front of the door, so when someone opens the door it activates the alarm. It has adjustable sensitivity and can be turned off entirely. During the day it will not be beeping when you don’t want the alarm on. To keep it powered you’ll need one 9V battery.