Set of 6 Door and Window Alarms, Magnetic Intrusion Detector, 120 dB, for Child Safety, Home Security, and Office Protection (AAA Batteries Not Included)

Dimensions: 6.4 cm x 4.2 cm x 1.7 cm. Space-saving installation. Three on/off settings. SMART DESIGN: The alarm and magnetic strip are separated by more than 10 mm, ensuring continuous triggering until the door is closed (by connecting them) or the alarm is silenced (by pressing the "STOP" button). AUDIBLE ALARM: The door and window sensors are powerful enough to detect intrusion, keep children and babies from wandering off, and protect your office, garage, dorm room, or apartment, whether you're inside or outside. You'll definitely hear it from another room. Young children cannot tamper with it; simply place it up high, out of their reach. Compatible with sliding doors, windows, drawers, and refrigerators. EASY INSTALLATION: Clean the flat surface, remove the protective film, attach the alarm to the door and the magnetic strip to the frame. That's it! ENERGY SAVING: The power supply battery lasts for more than a year (2 x 1 year). 3A batteries not included. [NOTE: 1. Remove the plastic insulating sheet from the battery compartment before use. 2. The small triangle on the side of the magnet must be aligned with the small triangle on the side of the alarm, with a gap of less than 10 mm. 3. The frame and the window or door must be perfectly aligned; these two elements must be installed flush with each other.] [We recommend checking the battery status.]