HAUPPAUGE, N.Y. The BPS4228L-12-CS-DA piezoelectric siren/sounder from Intervox (ICC) delivers a sound-pressure level of more than 110 dB at 3 feet for telecom, instrumentation, medical, automotive, consumer electronics and home-security alerts. The unit is powered by a 6- to 14-volt dc input and delivers a pulsating 2- to 3.5-kHz tone. It's priced at $3.18 each in the thousands.
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