Get a full-size Logitech wireless keyboard for $35 | ZDNET
Keyboard Science] TIL that the Logitech K800, the K810 AND the M515 "Couch Mouse" all use a variation of this proximity detection technology to save battery life : r/MechanicalKeyboards
logitech K800 Wireless Illuminated Keyboard User Guide - Manuals+
Getting started with Logitech® Wireless Illuminated Keyboard K800