Krown Pay Phone TTY
This low profile TTY may be mounted on an existing pay phone shelf with any available flat surface measuring 9.5" W X 8.5" L X 1.25" H. The high-tech, stainless steel unit consists of a vandal-proof, sealed keyboard (to resist spilled liquids); bright, 20-character display screen; 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.
More information: http://unitedtty.com/store/product184.html