Product features: Easy installation, stable and affordable. Compact size. Main part specifications: Length 6.2cm, width 3cm, height 2cm. Accessory specifications: Length 5.4cm, width 1.3cm, height 1.1cm. Product Introduction: Utilizes electromagnetic induction technology for simple and cost-effective installation. In the open state, the device emits a 90dB alarm sound when doors or windows are opened, helping to enhance security while allowing fresh air and natural light. Product Use: Suitable for installation on doors, windows, cabinets, computers, drawers, and other areas where unauthorized access is not permitted. Triggers an alert when doors, windows, or computer cases are opened, providing a deterrent against intrusions. Ideal for home or business use, including hotel rooms, to help monitor personal belongings and improve safety awareness. Product Usage: Remove the adhesive backing on the security alarm and attach both components to either side of the door or window, maintaining a gap of 0–2 cm. Switch to the "ON" position to activate standby mode. If the door, window, computer case, or drawer is opened or moved, the device immediately emits a loud audible alarm. The alarm stops when the switch is turned to "OFF" or when the door or window is closed. Product Power Supply: Powered by 3 LR44 1.5V button cell batteries (included). Package Includes: 2 alarm sets.