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]Multi-scenario applicable]This door alarm can detect the status of your door or window. It can prevent your children and pet from sneaking, ensuring the safety of children and the elderly. A door alarm with wide applications, intrusion alarm, ideal for home, office, hotel, apartments, garages, residences or even RVs. Door alarm with batteries: the door entrance and window alarm works with a set of 3 LR44 button batteries. For each alarm, the device contains 3 LR44 button batteries. (Note: If the alarm does not work, please check if it is off or if you need to replace the batteries) ]100 dB Volume Window Alarm] If someone illegally opens the door or window, the window alarm sounds when the 100dB distance between the alarm and the magnetic sensor is greater than 0.39 inches. The door and window alarm can also be used as a pool door opener, garage door alarm or sliding door opener. The intruder door alarm detector can quickly alert you if there are any anomalies on your doors and windows. ]Quick to install and easy to use] Easy to install no wiring is required, just remove the sticker provided and install the alarm detector in different places in your home, e.g. on doors, windows, cabinets, drawers, gates, etc. (Note: Keep the mounting area clean and make sure the door magnet is not installed more than 0.39 inch from the arrow side of the magnetic strip). ]Compact size easy to carry] Door alarm size: 2.7 x 1.2 inches; Magnet dimensions: 1.5 x 0.5 inches; Wireless home siren door alarm is designed to be light and small, it can be tucked into any backpack when you are on the go. If you are staying alone in a hotel and the alarm sounds as soon as the door is opened, it will be your best security partner.