The minimum system for Apple Watch is Watch OS 2.0, and the minimum system for iPhone is iOS 9.
② Open the Watch app on your iPhone and tap the General option.
③ In the general list, find [Bedside clock mode], slide open.
④ Then charge the watch, and then put it on the desktop, you can see the bedside clock display screen. If you want to display the bedside clock again, just tap on the desktop to activate it.