Telecommunication Devices for the. Deaf (TDD) 1) Acoustic coupler accepts both circular and square telephone handsets; 2) Turbo Code and Auto ID; 3) Tone or pulse dial; 4) Direct connect (with two (2) jacks) to standard analog telephone line; 5) Sticky key feature (for single-handed typing); and, 6) Built-in, 24-character printer.
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