These HORN/STORBES use a low current to provide a high-decibel output and can be easily seen and heard from far away. They can be flush or surface mounted on a standard 4" x 4" electrical box and works with all Macurco™ control panels as well as the 6 and 12 Series detectors. 24 VDC. The HS-SYNC module can be used to synchronize multiple strobes per ADA and NFPA.