The Mini Travel Alarm is both a personal alarm and a travel security device. When used as a personal alarm, a tug on the alarm cord on top of the unit will activate the ear piercing alarm and it will continue until you press the top back down. It emits a loud 120dB blast making an impending criminal cower from the attention and run. The mini travel alarm also has an integrated Passive Infrared (PIR) motion sensor. The alarm senses motion and has a horizontal detection area of 30° and a detection distance of 10 feet making it perfect as an early warning device when you are vulnerable (like when asleep). You could use this in your room pointed toward the door in case it opens and someone tries to get in. When the sensor picks up their movement, it will sound off which will wake you and get them running.