The SpectrAlert Advance series of mini-horn sounders is ideal for providing cost-effective primary and secondary signaling for fire and security applications such as hotel, motel, or residential fire system applications, or where smaller notification devices are desired. Mini-horns offer 2 volume settings, high or low, as well as temporal or non-temporal tones, and are direct wired. Compatible with 12- or 24-volt systems. Mini-horns are compatible with the System Sensor synchronization protocol, and they can be mounted to single-gang back boxes for aesthetically pleasing applications.