This very loud two-tone siren can be used to make the Game Timer Pro or Defusable Clock much louder. It can be driven with a 6-12V DC. The siren should be controlled by a relay, and not connected directly to the existing piezo buzzer on the Game Timer Pro or Defusable Clock board.
Crazy-loud output = 108dB
Dimensions: 1.84″ x 1.53″ x 0.88″ (47cm x 39cm x 22cm)