NOTICE: If you choose China post air mail free shipping and the order less than $30 ， for the low profit ，the packages all will send by hongkong post without tracking number ，hope you can understand .normally deliver time about 15-30days (brazil need about 30-60days).sometimes need a little long by accident .Please be patience and don\'t worry .If the order less than $30 and you need send with tracking number .please choose hongkong post need $2.11 for the tracking number .Thank you !!!
Descriptions:
100%Brand New and High Quality
With the function of AGC (automatic gain control)，
suitable for hearing AIDS， conference microphone， propaganda apparatus equipment use.
Output can be direct drive ordinary 32 ohm headphones (if you want more output， on the output side added Pre-amplification or amplifier)
suitable for single section 18650 or mobile phone battery power supply to use
board size: 30 mm * 25 mm
Operating voltage:DC3.6 v to 12 v
AGC switch: when you don\'t answer the jumper cap， AGC function is open， connected to the jumper cap is closed (with a jumper cap)
Packaging
1pcs*MAX9814 electret microphone amplifier board with AGC Function
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