HCM1801 : 1.5V, <=50mA, >=80dB, 2048Hz
HCM1806 : 6V, <=50mA, >=85dB, 2048Hz
HCM1812 : 12V, <=50mA, >=85dB, 2048Hz
HCM1824 : 24V, <=50mA, >=85dB, 2048Hz