S-A490 Intelligent Sounder is a kind of audible alarm device initiated by control panel or manual call point in fire room or in the field. It can give audible alarm when applied to warn people in field.

The sounder can use shallow base with 25.5mm high or deep base with 40mm high, it employs deep base if there is no special statement in this manual.

• Providing two tones.
• Initiated by shorting external terminals, not affected by loop power cut.
• Polarity insensitive signal loop and power loop, with features of cable checking in case of power cut.