TURN ON WATCH: Press and hold the Power/Home button until the screen lights up and the Samsung logo is displayed. Note: If you are unable to turn your device on, plug the device into a power source for 15 minutes and then try again. For information on charging your device, see the Charge the Battery tutorial. The SIM comes preinstalled and cannot be removed.
TURN OFF WATCH: Press and hold the Power/Home button.
Select Power off. Note: If you are unable to power your device off or if it becomes unresponsive, press and hold the Power/Home button for 10 seconds, until it reboots.