The Intellivision II by Mattel is sought by collectors worldwide. It delivers complete gaming control with sharp, detailed graphics and high sound quality right out of the box. Included are a music keyboard and a sleeker case in white. Mattel's 49-key musical synthesizer keyboard was a first of its kind in the gaming industry and intended for teaching music as well as entertaining users with games like Melody Blaster. The LED light on the console provides updates on the device status, letting you know whether it is off or on. The multifunctional power button also acts as a reset switch and an off/off switch that turns off the device when held down for five seconds. You can press the 1 and 9 buttons to set the game on pause during breaks. The controllers for the Intellivision II by Mattel have a flat-surface, a 12-button numeric keypad, and four action buttons on the sides. Each controller has a directional disk that is able to move in 16 directions. The original Intellivision II also includes the System Changer, a device that allows the user to play Atari 2600 games. Original video games for Intellivision come in cartridge form. The Intellivision is compatible with cartridge games for many vintage arcade titles, thus contributing to the enormous popularity of the console. The Intellivision is also compatible with educational games for young players, which is another key component that made the system a hit. Mattel was known for many firsts at the time. For instance, Mattel improved the audio on its system consoles when it released IntelliVoice, an innovative add-on device that produces voice synthesis for certain games. Only four Mattel games were released for the IntelliVoice: Space Spartans, Bomb Squad, B-17 Bomber, and Tron: Solar Sailor. Mattel continued to make new games for Intellivision consoles until 1991. Collectors and video game system enthusiasts alike seek out and enjoy the Intellivision II by Mattel, along with its many games.