I have 3 Intellivision.
One regular and two Intv System III.
Not much difference between them. Intv System III has a power lamp and one of the two System III has bit different controllers.

See Intellivision Games menu for some games.

Regular Intellivision and Intv System III

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• General Instrument CP1610 16-bit microprocessor CPU running  @ 894.886 KHz NTSC and full 1 MHz in PAL/SECAM models
• 1456 bytes of RAM
• 7168 bytes of ROM
• 159 pixels wide by 96 pixels high (159x192 display on a TV-screen, scanlines doubled)
• 16 color palette, all of which can be on the screen at once
• 8 sprites
• 3-channel sound, with one noise generator (audio chip: General Instrument AY-3-8914)
  
  Intellivoice (Voice Synthesis Module)
  
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  View the embedded image gallery online at:
  http://magnus.myftp.org:8080/joomlaCMS/index.php/intellivision#sigProId7d7154446a