Always on display, I set my watch to both during and not during activity to NEVER timeout, yet the display still dims. I don't mind charging it every day. Gestures are on, but not always reliable to light the display up when twisting my wrist. I have sent in for a replacement, but my wife's (same watch) fails as well. I am wondering if it's the 645 series that has the problem. Originally the watch did keep the display lit when on the desk, then, as instructed I did a total system reboot, and back to timing out when I have it set not to. Anyone else with another type of Garmin getting theirs to stay on, not that anyone would, but I do. Going from a bright and brilliant looking Fitbit to this much dimmer watch takes some getting used to and for my eyes, I prefer the always on display. Thanks.