[Dual Function] The alarm door stopper is equipped with an alarm switch. When the alarm status is turned to "on", any pressure on the door will trigger a 120dB loud alarm for enhanced security. When the alarm is turned "off", the device functions as a standard rubber-based door wedge to hold your door open at any desired angle. [Portable & Easy to Use] Weighing approximately 4.7 ounces, this door stopper alarm is lightweight and portable, ideal for travel. No installation is required—simply press the power button on the back to activate the alarm and place it behind any inward-opening door. Ensure the gap between the bottom of the door and the floor is between 0.39 to 1.38 inches before use. [3 Sensitivity Levels] This door stopper features three adjustable sensitivity levels: high, medium, and low, suitable for different door conditions. High sensitivity is recommended for gaps under 0.39 inches, while medium or low settings are appropriate for gaps between 0.39 and 1.38 inches. [Ultra-Durable & Loud Alarm] Constructed with a stainless steel cover, high-quality plastic body, and damping rubber base, this door stopper offers long-lasting durability. The 120dB alarm provides a powerful deterrent against intruders and alerts occupants immediately. Requires a 9V battery (not included). [Dimensions & Support] Dimensions: 5.45 x 1.8 x 1.52 inches. Designed to fit inward-opening doors. Makes a thoughtful gift for holidays such as Christmas or Thanksgiving. If you experience any issues, please contact customer support. If the alarm sound weakens or stops, replace the battery promptly.