The door alarm is "ON" and will sound up to 130 DB in the event of an attempted break-in. A loud alarm can scare intruders and alert homeowners. It can better protect you and your family. The door stop alarm is in the "off" position and can be used as a regular rubber base door wedge. The anti- design makes the door difficult to push, thus maximizing your safety. Weighs approximately 1.5 ounces each; Easy to carry; Alarm is 120db louder to protect you; Great for travel; Perfect for bedrooms, hotels, apartments, dormitories, front doors, etc.; Peace of mind when traveling alone or at work. 3* LR44 battery powered, one battery can year under normal circumstances. (Note: Batteries are included in the package) The anti-theft door catch consists of a stainless steel cover, a high-quality plastic body and a shock-absorbing rubber bottom, making it durable. In addition, the siren's volume is as high as 130 decibels, which can scare intruders and alert homeowners, making it an excellent choice for the safety of you and your family. Please note that the door alarm comes with batteries and does not need to be purchased outside the home. Colour:black Material:Metal+plastic Package Contents: 2 x Door stopper Only the above package content, other products are not included. Note: Light reflection 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.