Scrabble Brand SENSOR, Electronic Word Game (Commercial, 1979)

About Scrabble Sensor, from BoardGameGeek:

Predecessor to the Scrabble Lexor, Scrabble Sensor was touted as the hot new electronic word game to spice up game night or to bring Scrabble on the go. Gameplay is more like mastermind and hangman as opposed to traditional Scrabble play. Featuring solitaire, singles, doubles, and scoring variations of play. Players use the keyboard to enter and guess at hidden words through the console with the aid of lights and beeps to give hints.