“When Keycard is installed and run, it will sit in your menu bar waiting for instruction. First, you’ll need to detect and pair it with your iPhone, iPad or any other Bluetooth-enabled device, assigning it a device capable of operating as your keycard,” Brian reports. “Once you have paired the device and it is recognised, you can simply walk away from your Mac and it will lock itself automatically. You can also set a 4-digit PIN code to unlock your Mac in an emergency (or when you don’t have your device with you).”
Read more in the full article here.