Description:
Operating voltage: 5V-12V (voltage below 5V sound will be significantly reduced, the limit voltage can not exceed 15V);
Operating current: 1mA (static) ~ 150mA (max);
Output speaker impedance: 4 Ω-32 Ω(impedance high-sound, high efficiency);
Support the speaker power: 0.5W-25W (In fact, any power speaker can be used, the volume and the speaker power is not much relationship, as long as greater than the power amplifier output rating on the line);
Output power: 750mW (max);
Input support: electret, microphone, condenser microphone, moving coil microphone, audio signal.

Note:
1.Amplifier board IN and GND use shielded cable access electret microphone, access to the attention of the polarity, the electret after the reverse will be very little or no sound
2.Amplifier OUT board connected speakers, speakers away from the microphone, in order to avoid self-excited noise
3.Power amplifier board positive and negative access 5 ~ 12V DC power supply, please do not reverse, otherwise it will burn out the module

Package Included:
2 x DC 5V-12V Micro Electret
2 x Electret Microphone
2 x DC Female Power Pigtail Cable