Works perfectly with Bluetooth 4.0

I set the program to wake up my MacBook with the fingerprint scanner on my iPhone.
When I hit the power button on my laptop the login screen turns green after a second. My phone vibrates and a message appears on the phone. If the phone is unlocked you press "unlock". If the phone is locked you also need to unlock the phone with the fingerprint scanner. The laptop unlocks instantly.

Lar28 about Knock – unlock your Mac without a password using your iPhone and Apple Watch