The Doohickey Perfect Alarm 4 Pack Wireless Self Adhesive Magnetic Door Alarm offers a reliable and convenient way to enhance your home security. Each alarm is powered by batteries and features a 90dB operating sound rating for quick response. The wireless connectivity allows for easy installation without the need for any additional accessories. The included items such as the alarm unit, batteries, and magnetic sensor make it easy to set up and use. Perfect for indoor use, this door alarm from Doohickey provides peace of mind and safety for your home.