Sparkfun Electronics Large Piezo Alarm - 3KHz

The Large Piezo Alarm - 3KHz is a great option for when you need a loud audible alarm (or are just looking for a way to prank your friends). This alarm produces a 3KHz at up to 100dB(A) and has an input range of 3V to 18V. Loud audible alarm; 3V to 18V input; 3KHz at up to 100dB(A)