AD22A08 DC 12V 8 Channel DTMF MT8870 Decoder Relay Board Manuals

8 Channel DTMF Controller Commands Setting Manual (.docx file)

8 Channel DTMF Controller Manual (.docx file)

MT8870D/MT8870D-1 ISO2-CMOS Integrated DTMF Receiver Spec Sheet (.pdf file)

DTMF Dial Install Program (.exe file - suggest save)