Vibration Window Alarm: Built-in vibration sensor that activates a loud alarm when vibrations are detected, offering reliable security against potential intrusions. | Ultra-Loud 120dB Alarm: Captures immediate attention, effectively deterring intruders and alerting nearby individuals with its powerful sound. | Customizable Sensitivity: Easily switch between high and low sensitivity settings to reduce false alarms and maximize detection precision. | Visual and Low Battery Alerts: Equipped with a red warning LED that flashes every 4 seconds; A continuously lit LED indicator signifies a low battery, ensuring constant readiness.Includes deterrent stickers for additional visual warning, enhancing security awareness. | Effortless Installation & Long Battery Life: Wire-free setup designed for convenience. Powered by 3A batteries for longer operational periods, effectively reducing the frequency of battery replacements. (Batteries not included.)