General Use Siren BS-540 12-24VDC With Volume Adjuster 921540000
General purpose electronic siren with adjustable intensity 0-100dB, operating voltage 12-24V DC. From Olympia Electronics.
The BS-540 general purpose electronic siren produces a loud and sharp sound when supplied with 12 or 24 V DC. It is used in alarm or fire detection systems and in any other control unit with 12 or 24V DC output