AMSECO's Fire and Emergency Communication Speakers are suitable for fire protective signaling systems, emergency evacuation and mass notification systems. The 25-volt RMS or 70.7-volt RMS selective-input voltage models provide six field-selective wattage ranges. Devices with "-2" denotation have wattage tap settings of ¼, ½, 1 and 2. Devices with “-8” versions have wattage tap settings of 2, 4 and 8. All devices allow for multiple voltage settings. The low-profile speakers can be installed on a standard 4-inch electrical box with an extension ring.