Harmony 650 vs 665: Which Budget Logitech Remote Wins? - Universal Remote Reviews
Amazon.com: Remote Case for Logitech Harmony 650, Tading Shockproof and Anti-Drop Silicone Protective Case Cover Skin for Logitech Harmony 650/665/700 Remote Controller - Black : Cell Phones & Accessories
Logitech Harmony 665 review: The best standalone remote for most environments | TechHive