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. Scare off an attacker and summon help with the Streetwise iAlarm. At 100dB, it is loud enough that anyone nearby will hear it. Includes a light for nighttime safety and PIR motion detector. A person is most likely to be attacked at night while walking to or from their car or home. This compact alarm easily attaches to your keys so it's always within reach. Covered under a year warranty. Measures: 2 and five-eight inches x 1 and three-eight inches x seven-eight inches.