Fangrui Product Details High-decibel Alert For Maximum Security: This Portable Alarm Door Stopper Features An 80db High-decibel Alarm That Effectively Deters Intruders And Immediately Alerts Occupants To Potential Threats, Ensuring Reliable Protection. Adjustable And Durable Design: Equipped With An Adjustable Anti-theft Jammer, This Alarm Door Stopper Fits Most Door Types. Built With High-strength Alloy, It Ensures Long-lasting Durability And Stability For Enhanced Security. Quick And Tool-free Installation: No Tools Required-set Up Or Remove The Alarm Door Stopper For Bottom Of Door In Just Seconds. For Use At Home, In Hotel Rooms, Or While Traveling. Vibration-activated Alarm System: Designed With An Advanced Vibration Sensor, The Alarm Triggers Instantly When Force Or Movement Is Detected, Providing Dependable Safety For Any Door. Compact, Portable, And Battery-powered: Lightweight And Easy To Carry, This Portable Alarm Door Stopper Runs On Two Long-lasting Button Batteries, Offering Up To 3 Months Of Standby Time.