1,onboard MT8870 frequency decoder chip.
2,onboard voice input interface.
3,onboard five LED light, convenient to check the output state.
4, the basic have lead to chip mainly tube feet.
5, PCB size: 26.5 (mm) x24.5 (mm).
Manufacturer Website
- What's included
- DTMF MT8870 Module Telephone Decoding for Raspberry PI and Arduino1x