FIXED - Harmony Smart Control Lost OK Button : r/logitechharmony
How to Change battery in Harmony Companion - YouTube
Harmony Touch Battery Replacement - YouTube
Amazon.com: Case for Logitech Remote, Protective Silicone Remote Case ONLY for Logitech Harmony Companion All in One Remote Control Shockproof Washable Skin-Friendly Remote Control Cover with Loop (Black) : Electronics