Cebek DTMF-1 | DTMF Transmitter Module | Quasar Electronics Limited
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16 Tone DTMF Generator Keypad 1234567890*#ABCD, 1750Hz tone burst, and CTCSS functionality:Amazon.com:Appstore for Android
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DTMF Generator Click
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DIY - DTMF Tone Generator and Decoder Circuits
Keypad DTMF Generator Module Audio Encoder Transmitter Board for Arduino | eBay
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