Versatility: The Door Stopper alarm is powered by a built-in battery and is very portable. Its small size and non-slip wedge-shaped design make it ideal for bedrooms, apartments and offices as well as hotel rooms. The Door Alarm Stopper can be used on almost any floor surface - including carpet. Versatility: The Door Stopper alarm is powered by a built-in battery and is very portable. Its small size and non-slip wedge-shaped design make it ideal for bedrooms, apartments and offices as well as hotel rooms. The Door Alarm Stopper can be used on almost any floor surface - including carpet. Powerful Protection: The sensitivity controller has three modes of high/medium/low sensitivity to meet your needs. When the door is pressurized, a 100 dB audible alarm sounds. In addition to loud alarms, there are also non-slip mats to prevent the door from being opened when the alarm sounds, to protect your safety. Effective deterrent: A 100 dB alert will sound when the door stop security alarm is activated, which is audible for a distance of 300 feet (100 meters) and you can be woken up even when sleeping. Remind and surround the neighbors of the presence of intruders and make them go away DIY installation and low cost: Easy to install, no wiring required. Safely open and place alarm door stops within seconds of opening the door inward. No extra installation fees and no need to pay inspection fees every month Long Lifespan: Our door stopper with alarm is made of high quality materials and the quality is second to none. It's made of heavy-duty brushed stainless steel and black anti-scratch engineering plastics that won't become brittle or brittle. This makes the durability and consistency of our doorstop unrivaled