The KSN1212A provides the following advantages:

• Sound Pressure Levels up to 116 db at 1 meter, PCB mounted.
• Multiple mounting options: PCB, Panel Mount Flange Mount, Port/Horn Interface.
• Rugged construction for harsh environment.

 See Data Sheet below-

Link : http://www.bestgrouptechnologies.com/piezosource-ksn1212a.php