This little gadget, the Cavius is a new travel alarm
with four functions for travelers. it can be used as a personal deterrent, it emits a high-pierced noise to startle attackers. It can be attached to a hotel room door or drawer to guard valuables and it also serves as an optical smoke detector for use in tents or boats. The Cavius even protects your luggage because is has a movement detector to prevent people messing with your stuff. The four-inch Cavius sells for $79.95.
[via The Moodie Report