Built In Alert Feature: Contains an perceivable warning indication that activates instantly when moved, providing extra security by notifying caregivers of potential hazards Broad Compatibility: Works with most standard doors ( 130x110mm, center width 70mm), fitting various upward opening locks to strengthen home protecting User Friendly Button Mechanism: Features a press button allowing 180° rotation for adult access while remaining challenging for children to operate, balancing usability with security Damage without Installation: Needs denial drilling—quickly attaches and removes without leaving marks or damaging surfaces, ideal for rental homes or temporary setups Home Security Solution: This door stopper alarm helps accidental door openings, specially designed to protect children and pets while maintaining household with its secure locking function, Manufacturer: Kaeltsyn