Harmony 650 vs 665: Which Budget Logitech Remote Wins? - Universal Remote Reviews
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Logitech Harmony 665 universal remote control review
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User manual Logitech Harmony 665 (English - 84 pages)
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Logitech Harmony 665 review: The best standalone remote for most environments | TechHive
Logitech® Harmony® 665 Universal remote with color screen at Crutchfield
Logitech® Harmony 665 Advanced IR Universal Remote with Color Screen