If you have an Apple Watch and a Yale Smart Access product used with Wi-Fi and the Yale Access app, you can use your Apple Watch to lock and unlock. Open the Yale Access App on the device. Tap the green lock circle to unlock the door. Conversely, tap the red lock circle to lock it again.
PLEASE NOTE: The Yale Access Apple Watch App is available to Lock Owners only. Auto-Unlock does not work with Apple Watch. Remote operations are not possible.
Apple provides detailed instructions on how to set up your apps to appear on your Watch here.