Fangrui Product Details A Door Stop Alarm Has A Dual Purpose As It Can Be Used As Both An Alarm And A Door Stop. Prevents Doors From Sliding And Unwanted Intruders From Entering, Making It Protection For Your Home And When Traveling. Our Doorstop Alarm Is Designed With Three Levels Of Sensitivity: High-medium-low. You Can Adjust It Based On The Space Between The Door And Floor And The Type Of Flooring. Its For Doors With Floor Space Between 0.6 And 1.2 Inches, To Provide Extra Security In Your Home Or . The Door Stop Alarm Is Designed With A Loud Alarm Setting That Features A Loud Sound Of 120 Decibels That Activates In The Event Of Unauthorized Entry. If Someone Tries To Break In, The Door Stop Not Only Block It, But Also Sound An Alarm To Alert You. Please Note That The Volume Level Cannot Be Modified. Our Doorstop Alarm Is Powered By A 9v Battery, Ensuring A Lifespan Of Up To One Year With Normal Use. To Maintain Their Effectiveness, We Recommend Replacing The Batteries When The Sound Is Minimized