Set of 4 wireless magnetic door and window alarm sensors for home security system, child safety – Anti-theft and intrusion detector, 120 dB siren with battery

Your Home Security System – The 120 dB alarm not only gives burglars a huge jolt, but it can also wake you up while you sleep, preventing horrible accidents. A widely used door and window alarm, this anti-theft alarm is perfect for homes, offices, hotels, apartments, garages, dormitories, and even RVs. KEEP YOUR CHILDREN SAFE – This wireless magnetic sensor door and window alarm is powerful enough to detect entry, letting you know when your child opens a door or window to prevent children and babies from going outside, whether you are inside or outside the house. (Hearing distance up to 750 feet/230 meters). Especially if you have a swimming pool at home, installing a doorbell alarm is essential. Product Information: Smart design, easy to use - Dimensions: 6.4 x 4.25 x 1.7 cm. The door and window alarm has a smart size, an alarm sound of >120 dB, and is a unique ultra-thin design with 3 adjustable settings (on/off/on). Wireless magnetic sensor trigger alarm: triggers the alarm when the front door or window is opened. Installation method: Easy to install with double-sided tape – Easily install on windows or doors using the adhesive tape. No wiring required! No screws required! You can install this alarm on any door, window, drawer, gate, and other surfaces. Comes with batteries for easy use. The door and window alarm is powered by three LR44 button cell batteries. Each alarm unit contains three LR44 button cell batteries, and we also provide 10 extra batteries. When the alarm's battery is low, you should replace the batteries to better protect your home. Three adjustable settings: ON/OFF/SET. Flip up to ON: Open the door; the alarm will continue to sound. Close the door to stop the alarm. Flip to the middle position (OFF): Turns the device off. Flip down to SET: Activates the reminder mode to close the door or window. It emits a "DIE...DIE...DIE" sound to remind you to close the door/window. The alarm will stop until the door or window is closed. Features: Easy to install, designed for door and window security. Installation with double-sided adhesive tape; secure and convenient. (The double-sided tapes used separately for the alarm and magnetic strip are included.) Easy to use, one-button switch control. Energy saving, battery included, ready to use. (Each alarm contains 3 LR44 button cell batteries; we also provide 10 extra batteries.) System Operating Principle: Wireless magnetic sensor-triggered alarm. It will sound an alarm when the distance between the alarm and the magnetic strip exceeds 10 mm. Application Scenarios: Home/dormitory/hotel anti-theft; prevents children from climbing out of windows and falling; prevents thieves from sneaking through windows; secures valuables in drawers. Power Supply: 3 LR44 button cell batteries. Note: When the alarm's signal is weak, you should replace the batteries to better protect your home. Installation: Easily mounted on the window or door using the double-sided adhesive tape. No wiring required! No screws required! Step 1: Attach the double-sided adhesive tape to the back of the alarm and the magnetic strip. Step 2: Wipe the corresponding area on the door/window, stick and secure the alarm, then press firmly. Step 3: Follow step 2, stick and secure the magnetic strip. The gap should be less than 10 mm (the two small triangles on the alarm and the magnetic strip must be aligned). Step 4: Test the alarm. Activate the alarm, open and close the door or window to check if the alarm is working correctly. Specifications: Alarm sound: >120 dB; Alarm size: 6.4 x 4.25 x 1.7 cm; Package size for 4 alarms: 19 x 7 x 3 cm; Weight per alarm: 32 g; Package weight: 150 g; Package includes: 4 x Door and window alarms (each alarm contains 3 LR44 button cell batteries); 10 x Additional LR44 batteries