Enables manual DTMF tone entry via the keypad during transmission, facilitating autopatch usage. Constructed from durable materials for long-lasting use. FT-100D, FT-1500, FT-1500M, FT-1802, FT-1802M, FT-1807, FT-1807M, FT-1900, FT-1900R, FT-1900E, FT-2600, FT-2600M, FT-2800, FT-2800M, FT-2900, FT-2900R, FT-3000, FT-7100, FT-7100M, FT-7800, FT-7800R, FT-7800E, FT-7900R, FT-8100, FT-8100M, FT-8500, FT-8500M, FT-8800, FT-8800R, FT-8800E, FT-8900, FT-8900R, FT-8900E.
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