This TDD may be mounted on any public telephone shelf already in existence at your hospital facility and does not affect the use of the telephone by hearing users.
The high-tech, stainless steel unit consists of a vandal-proof, sealed keyboard, bright, 20 character display, call progress indicator and power switch. This is a direct-connect TTY that is hard-wired through the tip and ring terminals of the public telephone. Simply turn the power on and proceed with the TTY call as usual.