Audible Indicators: Type - Single Tone Signal; Mode of Operation - Continuous Tone; Sound Level Category - Loud Sound Level; Voltage - 16-28 VDC; Mounting Type - Screw Neck Panel Mount; Loudness - 85-95 dB @ 2 Ft; Current - 40 mA; Frequency - 2900 Hz; Material - 6/6 Nylon; Color - Black; Temperature Rating - -40 to 85 deg C; Terminal Type - Screw Terminals; Size - 1.69"Dia. x 1.41"Length (42.9x35.8mm); Mounting Size - 1.25" Dia. Panel Cutout; Manufacturer Series - Sonalert