General SHIELD Sounder Beacon Base is a loop powered sounder and beacon combined with a standard Intelligent Mounting Base. It is used to signal a fire alarm in enclosed areas. The Sounder Beacon Base can be used either with a detector fitted or with a cap for operation as a stand-alone alarm device. ■ Two volume ranges 55-75 dB(A) and 75-91 dB(A). ■ Beacon flash rate of once per second. ■ Synchronization of ‘alert’ and ‘evacuate’ tones . ■ Synchronization of beacon flash. ■ Individual and group addressing . ■ Unique acoustic and beacon self test.