BL-8513 wireless door/window entry alarm. It is a magnetic anti-theft alarm system designed to be installed on doors and windows.
How it works: The alarm consists of a main unit and a magnetic strip. When the door or window is opened, the magnetic strip separates from the main unit, triggering a loud alarm sound.
Power: It is powered by two AAA batteries.
Features: The alarm is wireless and does not require any wiring, making it easy to install.
Sound level: The alarm produces a loud sound, with some similar models reaching up to 120dB.