Dual Function: The bottom with mesh rubber can prevent the door sliding. With alarm switch, it can be used as a door stop alarm or door stopper.3 Level of Sensitivities: There are high, medium and low levels of adjustment, and the pressure sensitivity can be adjusted according to different situations.Compact Size: The door stop alarm is lightweight and compact. The weight is only 4.5 ounces. You can easy to carry around to go anywhere.Loud Alarm: Alarm volume up to 120 DB. The loud alarm can scare off intruders and alert the homeowner. It can better protect you and your family.Notice: Door stop alarm fits compatible with the inner pull door which the seam space is 0.6 to 1.2 inch. Powered by 9 volt battery(not include). When the sound fades or disappears, replace the battery.Colour:blackMaterial:rubberSize: 14 x 4.5 x 4cmPackage Contents:3 x door stopOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.