Door Alarm Door Opening Detector with Batteries, 4-Piece Door and Window Alarm Set, 100 dB Door Opening Detector, Window Alarm for Home, Hotel, Pool, Garage

[Multi-Scenario Applicable] This door alarm can detect the status of your door or window. It can prevent your children and pets from sneaking out, ensuring the safety of children and the elderly. A door alarm with wide applications, this burglar alarm is ideal for homes, offices, hotels, apartments, garages, residences, or even RVs.
[Battery Operated Door Alarm] The door and window alarm operates on three LR44 button cell batteries. Each alarm unit contains three LR44 button cell batteries. (Note: If the alarm does not work, please check if it is switched off or if you need to replace the batteries.)
[100dB Window Alarm Volume] If someone illegally opens the door or window, the window alarm will sound when the distance between the alarm and the magnetic sensor exceeds 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 burglar alarm door detector can quickly alert you to any anomalies with your doors and windows.
[Quick to Install and Easy to Use] Easy to install, no wiring is required. Simply remove the included adhesive strip and install the alarm detector in various locations around your home, such as on doors, windows, cabinets, drawers, gates, etc.! (Note: Keep the mounting area clean and ensure the door magnet is not installed more than 0.39 inches from the arrow side of the magnetic strip.)
[Compact Size, Easy to Carry] Door alarm dimensions: 2.7 x 1.2 inches; magnet dimensions: 1.5 x 0.5 inches; The wireless home door alarm with siren is designed to be lightweight and compact, easily fitting into any backpack when you're on the go. If you're staying alone in a hotel and the alarm sounds as soon as the door is opened, it will be your best security partner.