Product:Door Stop Alarm Mini size, space-saving. No installation required. Special design for use at home, office, hotel rooms. Ensures your safety and peace of mind at home or when traveling. Stainless Steel Cover. Adjustable High-Medium-Low sensitivity. Vibration sensor. No installation required, easy for travelers to carry. Wedge-shape design to fit any hinged door. 120 dB high-pitched continuous siren when activated. Can be used as a doorstop when power switch is turned off. Requires a 9-Volt Battery. (Not Included) Features: Material: Stainless steel cover Color: Silver and black Working modes: Vibration sensor Volume of the alarm: 120 dB Three sensitivity: High, Medium, Low Thank you for taking a look! All items from this seller ship from a smoke-free, dog-friendly home. I do, however search for items at estate sales and other locations so I cannot guarantee that all items come from a smoke-free home. If you have any questions, please feel free to contact me.