Sure Guard Electronic Personal Attack Alarm (Pack of 1) PASC. Safety is paramount and with this personal alarm you can guarantee that you have an easy way to prevent attacks and alert others to an unwanted situation. With a loud alarm of 130 decibels, this alarm can be heard up to half a mile away. This is the perfect way to ward off any attackers as well as alerting passers-by to the possibility of danger. This alarm is easy to keep on your person with a compact design that is perfect for hassle free portability. Personal alarm for the prevention of crime. 130 decibels. Portable for convenient use. Works at the touch of a button. Includes 9V battery. Audible up to half a mile away.