Plus+This Special edition has the same features as the Merriam-WebsterŪ Language Master Model #476000 (displayed top right).PLUS: Special features designed for those who are blind, visually impaired, speech impaired or learning disabled. Pronounces every letter, word, definition, synonym and learning game. Stores up to 26 messages for playback and use as an augmentative communication device. Adjustable character size for easy reading. Large keyboard for easy use. Includes press-on locator dots and orientation keys for easy navigation. Includes headphone for privit listening. A/C adapter included.Includes instructions in print and on cassette tape. Provides 300,000 definitions, the thesaurus 500,000 synonyms. Uses 4 AA Batteries.