Product details Door Stop Alarm Wireless Home Travel Security System Portable Safety Wedge Easily and affordable prevent intruders from entering through doorsit's great when you travel,too! No installation required, you simply place the battery-powered doorstop at the base of any door, turn it on and go about your business. Plus it has a nonskid bottom so you don't have to worry about it moving around. It sounds a piercing 120 dB siren if the door is forced. On/off switch on back. Each alarm uses 2 AA batteries (not included). An effective way to frighten away intruders No installation requiredSecures any hinged door and can be used as a non-skid door stop when the power is off. Portable Great for traveling door stopper Goes anywhere you need to feel protected Requires 1 x 9V batteries (not included) All Products From Us Have Undergone Strict Quality Checks. if There Is Any Quality Problem Or You Are Not Satisfied With The Product contact Us. we Will Give You The Best Solution.