With the Swann Doorstop Alarm protecting your home, apartment or small business has never been so easy and affordable. Simply place the Doorstop Alarm at the base of your door and when pressure is applied the alarm is triggered and will sound at any attempts of forced entry. Installation is a breeze! Just turn on and place at the base of the door you wish to monitor and you're done! The alarm is battery powered so it's 100% wireless. When armed, any forced entry to your door will activate the Swann Doorstop Alarm to emit an ear piercing 110db+ siren, keeping you and your family safe.