[Dual Function] The alarm door stopper is equipped with an alarm switch, if the door stopper alarm status is turned to "on", post which if there is any pressure on the door, a door stoppers security of 120db loudness will be triggered. Further, if the alarm status is in "off" status, then door alarms for home can be used as a common damping rubber base door wedge, to hold your door open at any particular angle. [Portable & Easy to Use] The door block alarm weighs about 4.7 ounces, which makes is super easy to take it with you when you are travelling. Further, the stopper needs no installation, just push the turn on button on the back of the door stopper security, to get the alarm into working status and place it behind any inner pull door. Please note to make sure that the gap between the door bottom and floor is 0.39 to 1.38 inches, before you purchase. [3 Sensitivity Levels] There are 3 levels namely high, medium and low, which can be adjusted as per different situations. Door stop with alarm, doorstop alarm security door wedge intruder alert, we recommend high sensitivity if the gap between your door and floor is less than 0.39 inches and if its between 0.39 and 1.38 inches, medium or low-level would be apt. [Ultra-Durable & Loud Alarm] The security door stopper is made up of stainless-steel cover, high quality plastic body and damping rubber bottom, making it durable for a long lasting experience. Also, the alarm is very loud at 120db, so that it can scare the intruders away and alert the homeowners, making it a no compromise aspect for you and your family's safety. Please note that the door alarm is powered by 9V battery, which is not included with the package. [Dimensions & After Sales] The door stop alarm measures 5.45 x 1.8 x 1.52 inches, where the door wedge fits for the inner pull door. Further, it makes a great gifting option for your friends and family during Christmas, Thanksgiving or any other special occasion. Also, if you have any problem or questions pertaining to the product, please feel free to . Please note that if the sound of the alarm fades or disappears, just replace the battery.