The SpectrAlert Advance MH Series mini-horns are available in red or white. They feature 12 or 24 volt operation, high and low volume settings, and temporal or continuous tones. These small footprint horns can be mounted to single gang back boxes for aesthetically sensitive applications. If required, the MDL module can be used to provide synchronization. Also known as -System Sensor By Honeywell-Us MINI-HORN, RED - BK-MHR