HCM1201A : 1.5V, <=70mA, >=75dB, 2400Hz
HCM1203A : 3V, <=70mA, >=85dB, 2400Hz
HCM1206A : 6V, <=60mA, >=85dB, 2400Hz
HCM1212A : 12V, <=60mA, >=85dB, 2400Hz