The Large Visual Display is a large print display accessory for the Superprint 100-D, 4425, and 4420 (sold separately; see separate entries) telecommunication device for the deaf (TDD or TT) by Ultratec. The characters on the large display are 10 times larger than characters on a standard TDD display and are displayed in bold type. TDD conversations are shown simultaneously on the TDD display and on the large visual display. The display connects to the Superprint 100-D, the Superprint 4225, or Superprint 4420 with an external printer port. The Superprint 100-D has special software to connect the Large Visual Display directly to the TTY port, so it does not support printing capabilities. The Superprint 4420 can be purchased with an external port that enables connection of the display or an external printer while retaining the use of the built-in printer. OPTIONS: Visual Display Stand. WARRANTY: One year limited.