Ahlsen - Window Alarm, 4 Packs Door and Window Alarm Security Door Window Burglar Window with Loud 120DB Siren - Easy to Install, 75 x 39 x 12.2mm

Loud: 120dB siren alarm not only gives thieves a big shock, but also wakes you up in your sleep. Prevent a terrible accident. Keep your kids safe and know when they open the doors! Perfect for your home, office, garage, dorm room or even RV. Easy Installation: No wiring required! No screws needed! Double-sided tape included! 3 x LR44 batteries, batteries not included. Extra Level of Security: Ultra-sensitive low battery indicator to check battery life. Low Battery Warning: The flashing light reminds you to replace the battery to better protect your home. Easy to Use: Unique door and window alarm in ultra-slim design with 2 adjustable settings (Off/Alarm). Alarm triggered by magnetic sensor: Alarm will be triggered after the front door or window is opened. Save hundreds on alarm installation costs. This is the affordable, affordable price for your home. Note: The data is all measured manually, please allow an error of 1-3cm. Due to the difference in light and display, there may be