The watch will automatically return to the clock screen and lock after 60 seconds of inactivity. To unlock the screen, quickly tap the lower part of the touch ring three times. To lock the screen, and prevent the watch from automatically returning to the clock screen after 60 seconds, use the same 3 quick taps motion. You will feel a vibration and see a lock appear on the screen. You can also lock the watch on any desired screen with the 3 quick taps motion.
Only the touch ring around the display responds to touch. The touch interface does not function when it is wet, wipe the glass dry to enable it again.