This item is an effective security alarm device which is suitable for home, office and outdoor travelling with ultrahigh loudness of 120db alarm. It is widely used in hinged door for its mini appearance and wedge-shaped skid-resistant design. It must be a right choice for your home and office security. Features: - Color: Black. - Material: Plastic and Metal - Size: Approx. 14 x 4.5 x 3.8cm/ 5.5 x 1.8 x 1.5 inch(LxWxH). - Alarm: 120db - Made of quality material for and reusable use. - Easy to operate. Turn on the sensitivity button on one side of the stopper and then place the door stop alarm at the gap between the door and the ground or behind the door, it will make loud alarm sound immediately as soon as the metal part is pressed. - Multi-functional. Also can be used as an anti-skid door stopper if turn off the power . - Excellent assistant for your home, office and travelling security. - Note: Powered by a 9 Volt Battery. (Not Included). Package list: 1 x set of 2pcs Door Stop Alarm Home Security Door Stopper Triggered Door Stop Door Accessory