At about 2.5 inches tall this handy security device slips easily into a pocket or purse, but don't let its small size fool you. The micro technology used in this alarm provides features that are similar to ones found in alarms 3 to 4 times its size. It is great for home, business, hotel or dorm. It can be used as a personal alarm for self defense, or set to motion detection to protect your valuables while you are out of your room. The motion detector can also be used to prevent children from wondering into a dangerous area, such as a pool.