Features:

1, onboard complex frequency decoder chip MT8870
2, voice input interface board
3, onboard five LED indicators for easy viewing output state
4, the chip have been drawn mainly basic pin
5, PCB size: 26.5 (mm) x24.5 (mm)
Note: PCB design, VCC pin and GND pin are in the opposite position, please be caution!
The VCC pin should be the GND pin , and the GND pin should be the VCC pin.
Package Included:
2 x MT8870 DTMF Voice Decoder Module Telephone/ audio Decoder Speech decoding module