1, onboard MT8870 complex frequency decoding chip

2, onboard voice input interface
3, onboard 5 LED indicator, easy to view the output status
4, the basic chip has been the main pin leads
5, PCB size: 26.5 (mm) x24.5 (mm)
Note: This version of the PCB design, pin-pin VCC and GND of the silk screen to engage in anti-use, please use with caution.
Shipping list:
MT8870 DTMF voice decoding module x 1