Two-Tone Siren (490-0487) Specifications Faxback Doc. # 7390 Horn Speaker:.................................ABS, 3 5/8" (92 mm) diameter Operating Voltage:..........................................11-16 volts DC (12 volts nominal) Current Drain:................................................250 mA (max) Tone:..................................................Rise-fall or steady (Wiring-selectable) Output Level:....................................Rise-fall: 108+/-5dB at 1 meter Steady: 100+/- 5dB at 1 meter (LB/all-08/3/94)