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Home Security System - 90dB Siren Alarm: Not only does it cause a huge emotional shock to burglars, it also wakes you up from your sleep to avoid unpleasant surprises. Widely used door and window alarm, burglar alarm, ideal for homes, offices, hotels, apartments, garages, dorms, or even RVs. Keep your children safe - This wireless magnetic door and window sensor not only protects against burglars but also alerts you to unwanted entry or exit. For example, it lets you know when children open doors or windows and prevents them from leaving. It's also useful if you have a swimming pool at home to know if someone is opening the door... Audible range: up to 230 m. Easy to install with double-sided tape - Easily mounted on windows or doors with adhesive tape. No wiring required! No screws required! You can install this alarm on any window, door, or even drawers, cabinets, or cupboards! How it works: Each sensor consists of an alarm and a magnetic contact. The two components are mounted close together (less than 1 cm): one on the door frame and one on the jamb. When the door or window is opened, contact between the two components is lost and the alarm is automatically triggered. Simple and unbreakable! Each alarm runs on three LR44 batteries (included). Note that the mini alarm has two sounds: an alarm and a bell. You can also use it in a shop to alert customers when they arrive!