Durable with High QualityThe door stop alarm is made of large ABS plastic and stainless steel plate. Excellent performance in terms of quality and service period. Please note the gap between the door and the floor must be at least 10-35 mm for normal operation. Easy OperationThere is an ON/OFF button on the door stop alarm. Simply place the alarm under the door and turn on the switch and it will start working. As soon as an intruder attempts to enter, the door stop alarm will immediately go off and emit a 120dB alarm. . Adjustable Sensitivity LevelsAdjust the sensitivity of the door security alarm - low, medium and high. Choose the levels according to your needs. Set it high when you sleep and you will know the subtle differences of your door and get peace of mind. Excellent DesignThe shock-absorbing rubber at the bottom can prevent the door from sliding when someone shoot. Remember to push it firmly under the door when using. It is not recommended to use it on too smooth floors (such as tiles/laminate/wood) or to set a high sensitivity level if necessary. Can be used as a normal doorstop when turning off the switch and holding the doors in the correct position. Protect Your SafetyOnly requires one 9V battery (included). Lightweight (110g)/pack and convenient to carry and protect your safety no matter when you are at home or traveling. It is best used in doors that open inward (like hotels). Feel comfortable even when you are in an unfamiliar place. Feature High quality: Made of high absorption rubber and ABS, very comfortable to use. p> Loud alarm: 120dB alarm sound can scare away intruders. Portable alarm with 3 sensitivity levels: Low, Medium, High, with an adjustable sensitivity switch on the side. Easy installation: portable and easy to take on a trip or work alone. Widely used: It can be used at home, bedroom, office, hotel, motel, etc.