The listing, Ball Alarm - Portable security alarm has ended.
This is a nifty little portable alarm for use anywhere you need an alarm. It takes a 9v battery. It's motion activated and has a round bottom so it's sensitive to tipping over. You can use it on the floor inside your hotel room door, in a shoulder bag when you put it over the back of a chair at dinner, inside food storage while camping. There are lots of occasions where it will be helpful. It's about 3" tall.