MT8870 DTMF Speech Decoding Module Telephone Module, ccmcall control

Onboard voice input interface
Low power consumption
Internal gain setting amplifier
Onboard LED, it is very convenient to check the output state.
Adjustable guard time
?Central office quality
Onboard 3.5mm input interface
5 Channel interface
On-board MT8870 frequency decoder chip
Power-down mode
Inhibit mode
Onboard audio input interface
Onboard LED lights for output state indicationComplete DTMF Receiver.
Does not require external circuits or wiring, it can be inserted directly into the UNO/MEGA2560/DUE board to use.
12-Digital outputs decode mobile and fixed telephone keys (0-9, * #). Also, another 4 Digital output(ABCD) can use ?DTMF Dial? for Software control.