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
Amazon.com: Wireless Gaming Keyboard and Mouse,Blue Backlit Rechargeable Keyboard Mouse with 3800mAh Battery Metal Panel,Mechanical Feel Keyboard and 7 Color Gaming Mute Mouse for PC Gamer : Video Games