Imagine that an intruder picks the lock of your door, and it slowly begins to open If you have the Door Stop Alarm in place, it will send out a piercing siren that will send the criminal running in the opposite direction. This security device fits under any door like an ordinary doorstop, yet it lets out an extraordinary alarm sound. The rubber bottom won't slide on smooth surfaces, so it can be used on floors or carpeting. This brings added safety for hotel travel, school dorms, seniors, or anyone living alone. The Door Stop Alarm is easily portable, and will stand guard at your door wherever you stay. - Loud 120 dB alarm sound - Switch for 3 separate sensitivity settings - On/Off switch, dual use as doorstop - Operates on one 9V battery, not included - 5.5"l x 1.75"w x 1.5"h