PK-21N31PQ

Alarms, buzzers, and sirens are devices designed to alert people to potential danger. These days, they’re often found in homes, businesses, and public spaces to signify an emergency or a need to take protective measures. One type of alarm usually found in commercial and public settings is the PK-21N31PQ alarm.

This type of alarm is known for its high-decibel volume and piercing tone. It was initially developed for use in fire and emergency alert systems, but is now increasingly used in security systems, as well. The PK-21N31PQ alarm is particularly well-suited to these applications because of its near-universally recognizable alerting sound.

The alarm is triggered by an input signal, which can be wired or wireless. The signal can be delivered from a sensor after contact is made with a protective device, such as a door sensor, window sensor, or motion detector. Alternatively, it can trigger when an intruder’s presence is detected by security surveillance cameras.

Soon after the alarm is triggered, two large metal horns are activated. These horns are consistently producing a sound frequency of 87dB to 90dB at a distance of 1 meter away. This sound can be heard within a radius of 500 meters from the site of the speakers.

The PI-21N31PQ alarm also has a selectable output frequency control. This allows the user to adjust it to a lower volume, which is still loud enough to be heard but not as disruptive as the maximum volume. This makes it suitable for use in areas where people are not expecting an alarm, such as a quiet residential area.

The PK-21N31PQ alarm is a reliable and efficient way to alert people to an emergency or intruder. Its adjustable sound and near-universally recognized noise make it an ideal choice for public spaces and commercial applications.