The PDS Protective Door Stop Alarm is designed to thwart intruders. It is an industry leader and ideal for frequent travelers, college students and persons in shared accommodation. The PDS Protective Door Stop Alarm is highly recommended as an additional layer of security in hotel rooms, dorm rooms, shared living and active shooter situations. Simply place the door stop in place and when intruders attempt to enter the door stop is triggered releasing a high pitch alarm. Not only will the alarm alert you and scare away intruders, the door stop is designed to prevent intruders from opening the door creating another layer of security for you and you’re family.