Compatibility: This Safe Alarm is compatible with GSM Alarm and is suitable for most security alarm systems. Wide Application: Suitable for various public places, such as homes, shopping malls, schools, factories, hospitals, warehouses, stations, etc. Independent Alarm: On-site alarm, the alarm sound is up to 120dB, paired with door/window sensors, PIR motion detectors, to form an effective independent home apartment security system. Product Effect: This piercing plug-in siren can be plugged into your keyboard/console. It works with your system and responds to signals from the alarm keyboard/console. When one of the sirens sounds, intruders will not linger nearby. Easy to install: The installation options are flexible and convenient. Generally installed on the wall or doorway or balcony, etc., the installation height is 2.5 meters or more. Just stick it when installing, no wiring is required, and it is very convenient to use., Weight: 0.2645547144 pounds, Manufacturer: The Lord of the Tools