Ever stay at a hotel and wonder if someone was trying to get in your room?? Well, this alarm is ideal for any door knob at home, the office, a dorm or a hotel room… anywhere that you can think of that has a door knob. This handy-dandy security device will scare off unwanted intruders with 98dB alarm and will save you from spending hundreds of dollars on an expensive home security system. Personal protection at it’s best!